diff --git a/src/practice_files/practice_image/practice_image_info_by_bits.py b/src/practice_files/practice_image/practice_image_info_by_bits.py
deleted file mode 100644
index 13e6a88..0000000
--- a/src/practice_files/practice_image/practice_image_info_by_bits.py
+++ /dev/null
@@ -1,88 +0,0 @@
-from array import array
-
-
-def main():
-    """
-    SOS array('B', [255, 218, 0, 12, 3, 0, 0, 1, 17, 2, 17, 0, 63, 0])
-    length of segment depends on the number of components:  array('B', [0, 12])
-    number of components (1=monochrome, 3=colour):  3
-    0x01 = Y, 0x00 = Huffman table to use:  array('B', [0, 0])
-    0x02 = Cb, 0x11 = Huffman table to use:  array('B', [1, 17])
-    0x03 = Cr, 0x11 = Huffman table to use:  array('B', [2, 17])
-    start of spectral selection or predictor selection 0
-    end of spectral selection 63
-    successive approximation bit position or point transform 0
-    SOF array('B', [255, 192, 0, 17, 8, 5, 85, 8, 0, 3, 0, 17, 0, 1, 17, 1, 2, 17, 1])
-    SOF0 segement:  array('B', [255, 192])
-    length of segment depends on the number of components:  array('B', [0, 17])
-    bits per pixel:  8
-    image height:  array('B', [5, 85])
-    image width:  array('B', [8, 0])
-    number of components (should be 1 or 3):  3
-    0x01=Y component, 0x22=sampling factor, quantization table number:  array('B', [0, 17, 0])
-    0x02=Cb component, ...:  array('B', [1, 17, 1])
-    0x03=Cr component, ...:  array('B', [2, 17, 1])
-    """
-    with open("../../resources/35163667010_8bfcaef274_k.jpg", "rb") as fd:
-        content = array("B", fd.read())
-        v_content = memoryview(content)
-        start_of_scan = [0xFF, 0xDA]
-        start_of_frame = [0xFF, 0xC0]
-        eof = [0xFF, 0xD9]
-        meta_scan_info = None
-        meta_frame_info = None
-        body = None
-        body_idx = 0
-
-        for idx in range(0, len(v_content) - 2):
-            if [v_content[idx], v_content[idx + 1]] == start_of_frame:
-                meta_frame_info = array("B", v_content[idx : idx + 19])
-            if [v_content[idx], v_content[idx + 1]] == start_of_scan:
-                meta_scan_info = array("B", v_content[idx : idx + 14])
-                body = array("B", v_content[idx + 14 :])
-                break
-
-        # if [body[-2], body[-1]] != eof:
-        #     raise Exception("File not has valid end of file")
-        print("SOS", meta_scan_info)
-        print(
-            "length of segment depends on the number of components: ",
-            meta_scan_info[2:4],
-        )
-        print(
-            "number of components (1=monochrome, 3=colour): ",
-            meta_scan_info[4],
-        )
-        print("0x01 = Y, 0x00 = Huffman table to use: ", meta_scan_info[5:7])
-        print("0x02 = Cb, 0x11 = Huffman table to use: ", meta_scan_info[7:9])
-        print("0x03 = Cr, 0x11 = Huffman table to use: ", meta_scan_info[9:11])
-        print(
-            "start of spectral selection or predictor selection",
-            meta_scan_info[11],
-        )
-        print("end of spectral selection", meta_scan_info[12])
-        print(
-            "successive approximation bit position or point transform",
-            meta_scan_info[13],
-        )
-
-        print("SOF", meta_frame_info)
-        print("SOF0 segement: ", meta_frame_info[0:2])
-        print(
-            "length of segment depends on the number of components: ",
-            meta_frame_info[2:4],
-        )
-        print("bits per pixel: ", meta_frame_info[4])
-        print("image height: ", meta_frame_info[5:7])
-        print("image width: ", meta_frame_info[7:9])
-        print("number of components (should be 1 or 3): ", meta_frame_info[9])
-        print(
-            "0x01=Y component, 0x22=sampling factor, quantization table number: ",
-            meta_frame_info[10:13],
-        )
-        print("0x02=Cb component, ...: ", meta_frame_info[13:16])
-        print("0x03=Cr component, ...: ", meta_frame_info[16:19])
-
-
-if __name__ == "__main__":
-    main()
diff --git a/src/practice_files/practice_image/practice_pillow.py b/src/practice_files/practice_image/practice_pillow.py
deleted file mode 100644
index ae01ab4..0000000
--- a/src/practice_files/practice_image/practice_pillow.py
+++ /dev/null
@@ -1,31 +0,0 @@
-from PIL import Image
-from PIL.ExifTags import TAGS
-
-
-def main():
-    """
-    {'version': b'GIF89a', 'background': 21, 'transparency': 21, 'duration': 120, 'extension': (b'NETSCAPE2.0', 795), 'loop': 0}
-    24
-    360 360
-    """
-    img = Image.open("../../resources/266e9742dc0aa9230e6061710cad3a88.gif")
-    exifdata = img.getexif()
-    # iterating over all EXIF data fields
-    for tag_id in exifdata:
-        # get the tag name, instead of human unreadable tag id
-        tag = TAGS.get(tag_id, tag_id)
-        data = exifdata.get(tag_id)
-        # decode bytes
-        if isinstance(data, bytes):
-            data = data.decode()
-        print(f"{tag:25}: {data}")
-    print("=" * 32)
-    print(img.info)
-    # if img.format == "GIF":
-    if hasattr(img, "n_frames"):
-        print(img.n_frames)
-    print(img.width, img.height)
-
-
-if __name__ == "__main__":
-    main()
diff --git a/src/practice_files/practice_image/practice_pymediainfo.py b/src/practice_files/practice_image/practice_pymediainfo.py
deleted file mode 100644
index 8e79376..0000000
--- a/src/practice_files/practice_image/practice_pymediainfo.py
+++ /dev/null
@@ -1,69 +0,0 @@
-import json
-from pprint import pprint
-
-from pymediainfo import MediaInfo
-
-
-def main():
-    """
-    {'tracks': [{'codecs_image': 'GIF',
-                 'commercial_name': 'GIF',
-                 'complete_name': '../../resources/266e9742dc0aa9230e6061710cad3a88.gif',
-                 'count': '331',
-                 'count_of_image_streams': '1',
-                 'count_of_stream_of_this_kind': '1',
-                 'file_extension': 'gif',
-                 'file_last_modification_date': 'UTC 2020-05-29 02:44:01',
-                 'file_last_modification_date__local': '2020-05-29 11:44:01',
-                 'file_name': '266e9742dc0aa9230e6061710cad3a88',
-                 'file_name_extension': '266e9742dc0aa9230e6061710cad3a88.gif',
-                 'file_size': 181078,
-                 'folder_name': '../../resources',
-                 'format': 'GIF',
-                 'format_extensions_usually_used': 'gif gis',
-                 'format_info': 'Graphics Interchange Format',
-                 'image_format_list': 'GIF',
-                 'image_format_withhint_list': 'GIF',
-                 'internet_media_type': 'image/gif',
-                 'kind_of_stream': 'General',
-                 'other_file_size': ['177 KiB',
-                                     '177 KiB',
-                                     '177 KiB',
-                                     '177 KiB',
-                                     '176.8 KiB'],
-                 'other_format': ['GIF'],
-                 'other_kind_of_stream': ['General'],
-                 'stream_identifier': '0',
-                 'track_type': 'General'},
-                {'commercial_name': 'GIF',
-                 'compression_mode': 'Lossless',
-                 'count': '124',
-                 'count_of_stream_of_this_kind': '1',
-                 'format': 'GIF',
-                 'format_info': 'Graphics Interchange Format',
-                 'format_profile': '89a',
-                 'height': 360,
-                 'internet_media_type': 'image/gif',
-                 'kind_of_stream': 'Image',
-                 'other_compression_mode': ['Lossless'],
-                 'other_format': ['GIF'],
-                 'other_height': ['360 pixels'],
-                 'other_kind_of_stream': ['Image'],
-                 'other_width': ['360 pixels'],
-                 'stream_identifier': '0',
-                 'track_type': 'Image',
-                 'width': 360}]}
-    """
-    info = MediaInfo.parse("../../resources/35163667010_8bfcaef274_k.jpg")
-
-    attrs = dir(info)
-
-    for k in attrs:
-        if k.startswith("_"):
-            continue
-        print(f"{k}: {getattr(info, k)}")
-    pprint(json.loads(info.to_json()))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/src/practice_files/practice_media/practice_image_processing.py b/src/practice_files/practice_media/practice_image_processing.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/practice_files/practice_nlp/practice_kiwi.py b/src/practice_files/practice_nlp/practice_kiwi.py
new file mode 100644
index 0000000..0a32e25
--- /dev/null
+++ b/src/practice_files/practice_nlp/practice_kiwi.py
@@ -0,0 +1,9 @@
+from kiwipiepy import Kiwi
+
+s = "염료, 조제 무기안료, 유연제 및 기타 착색제 제조업"
+base = "[바이오USA] SK바이오팜, 피닉스랩과 생성형 AI 개발 MOU - 조선비즈"
+
+processor = Kiwi()
+
+print([(token.form, token.tag) for token in processor.tokenize(base)])
+
diff --git a/src/practice_files/practice_redis/practice_get_keys.py b/src/practice_files/practice_redis/practice_get_keys.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/practice_files/practice_sqlalchemy/__init__.py b/src/practice_files/practice_sqlalchemy/__init__.py
deleted file mode 100644
index 18cead5..0000000
--- a/src/practice_files/practice_sqlalchemy/__init__.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from . import model, practice_aliased_subquery
-
-__all__ = ['model', 'practice_aliased_subquery']
diff --git a/src/practice_files/practice_sqlalchemy/model.py b/src/practice_files/practice_sqlalchemy/model.py
deleted file mode 100644
index 3aba35b..0000000
--- a/src/practice_files/practice_sqlalchemy/model.py
+++ /dev/null
@@ -1,246 +0,0 @@
-from __future__ import annotations
-
-import enum
-import os
-
-from sqlalchemy import (
-    Column,
-    Enum,
-    ForeignKey,
-    Integer,
-    PrimaryKeyConstraint,
-    Text,
-    create_engine,
-)
-from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import relationship, sessionmaker
-
-Base = declarative_base()
-
-
-"""
-   +-------+     +---+           +---------+
-   |Company| --> |Car| ----+---> |Ownership|
-   +-------+     +---+     |     +---------+
- +----------+     +-----+  |
- |CreditCard| --> |Human| -+
- +----------+     +-----+
-"""
-
-class CreditCard(Base):
-    __tablename__ = "credit_card"
-
-    card_id = Column(Integer, primary_key=True, autoincrement=True)
-    provider = Column(Text)
-    bounded = Column(Integer)
-
-    user = relationship("Human")
-
-
-class Company(Base):
-    __tablename__ = "company"
-
-    company_id = Column(Integer, autoincrement=True, primary_key=True)
-    name = Column(Text)
-    location = Column(Text)
-
-
-class CarType(str, enum.Enum):
-    gasoline = "gasoline"
-    electric = "electric"
-    hybrid_electric = "hybrid_electric"
-
-
-class Car(Base):
-    __tablename__ = "car"
-
-    car_id = Column(Integer, autoincrement=True, primary_key=True)
-    name = Column(Text)
-    drivetrain = Column(Enum(CarType))
-    maker_id = Column(Integer, ForeignKey(Company.company_id))
-    price = Column(Integer)
-
-
-class Human(Base):
-    __tablename__ = "human"
-
-    id_number = Column(Integer, primary_key=True, autoincrement=True)
-    name = Column(Text)
-    credit_card_id = Column(Integer, ForeignKey(CreditCard.card_id))
-
-
-class Ownership(Base):
-    __tablename__ = "ownership"
-
-    human_id = Column(Integer, ForeignKey(Human.id_number))
-    car_id = Column(Integer, ForeignKey(Car.car_id))
-    register_num = Column(Text, unique=True)
-
-    __table_args__ = (PrimaryKeyConstraint(human_id, car_id),)
-
-
-def prepare_data():
-    if os.path.exists("test.db"):
-        os.remove("test.db")
-
-    engine = create_engine(
-        "sqlite:///db.sqlite3",
-        echo=True,
-    )
-
-    session_obj = sessionmaker()
-    sess = session_obj(bind=engine)
-
-    try:
-        Base.metadata.create_all(engine)
-
-        cards = [
-            CreditCard(provider="samsung", bounded=100000),
-            CreditCard(provider="hyundai", bounded=20000),
-            CreditCard(provider="shinhan", bounded=3000000),
-            CreditCard(provider="kookmin", bounded=4000),
-        ]
-        sess.add_all(cards)
-        sess.flush()
-
-        companies = [
-            Company(name="porsche", location="German"),
-            Company(name="audi", location="German"),
-            Company(name="bmw", location="German"),
-            Company(name="jeep", location="USA"),
-            Company(name="tesla", location="USA"),
-            Company(name="ford", location="USA"),
-            Company(name="Lamborghini", location="Italy"),
-        ]
-        sess.add_all(companies)
-        sess.flush()
-
-        cars = [
-            Car(
-                name="911",
-                drivetrain=CarType.gasoline,
-                maker_id=0,
-                price=50000,
-            ),
-            Car(
-                name="356",
-                drivetrain=CarType.gasoline,
-                maker_id=0,
-                price=100000,
-            ),
-            Car(
-                name="R8", drivetrain=CarType.gasoline, maker_id=1, price=45000
-            ),
-            Car(
-                name="A4", drivetrain=CarType.gasoline, maker_id=1, price=32000
-            ),
-            Car(
-                name="A6", drivetrain=CarType.gasoline, maker_id=1, price=38000
-            ),
-            Car(
-                name="M5", drivetrain=CarType.gasoline, maker_id=2, price=35000
-            ),
-            Car(
-                name="X3", drivetrain=CarType.gasoline, maker_id=2, price=35000
-            ),
-            Car(
-                name="Cherokee",
-                drivetrain=CarType.gasoline,
-                maker_id=3,
-                price=38000,
-            ),
-            Car(
-                name="Model 3",
-                drivetrain=CarType.gasoline,
-                maker_id=4,
-                price=48000,
-            ),
-            Car(
-                name="Model S",
-                drivetrain=CarType.gasoline,
-                maker_id=4,
-                price=48000,
-            ),
-            Car(
-                name="Model Y",
-                drivetrain=CarType.gasoline,
-                maker_id=4,
-                price=48000,
-            ),
-            Car(
-                name="mustang",
-                drivetrain=CarType.gasoline,
-                maker_id=5,
-                price=55000,
-            ),
-        ]
-        sess.add_all(cars)
-        sess.flush()
-
-        humans = [
-            Human(
-                name="ella",
-                credit_card_id=cards[0].card_id,
-            ),
-            Human(
-                name="scarlet",
-                credit_card_id=cards[1].card_id,
-            ),
-            Human(
-                name="wanda",
-                credit_card_id=cards[1].card_id,
-            ),
-            Human(
-                name="sally",
-                credit_card_id=cards[3].card_id,
-            ),
-            Human(
-                name="anastasia",
-                credit_card_id=cards[2].card_id,
-            ),
-            Human(
-                name="sandra",
-                credit_card_id=cards[2].card_id,
-            ),
-            Human(
-                name="penny",
-                credit_card_id=cards[3].card_id,
-            ),
-        ]
-        sess.add_all(humans)
-        sess.flush()
-
-        owners = [
-            Ownership(
-                human_id=humans[0].id_number,
-                car_id=cars[1].car_id,
-                register_num="abc1",
-            ),
-            Ownership(
-                human_id=humans[1].id_number,
-                car_id=cars[1].car_id,
-                register_num="abc2",
-            ),
-            Ownership(
-                human_id=humans[1].id_number,
-                car_id=cars[2].car_id,
-                register_num="abc3",
-            ),
-            Ownership(
-                human_id=humans[2].id_number,
-                car_id=cars[5].car_id,
-                register_num="abc4",
-            ),
-            Ownership(
-                human_id=humans[3].id_number,
-                car_id=cars[5].car_id,
-                register_num="abc5",
-            ),
-        ]
-        sess.add_all(owners)
-        sess.flush()
-    except Exception as e:
-        print(str(e))
-        sess.rollback()
-    else:
-        sess.commit()
diff --git a/src/practice_files/practice_sqlalchemy/practice_aliased_subquery.py b/src/practice_files/practice_sqlalchemy/practice_aliased_subquery.py
deleted file mode 100644
index 44424be..0000000
--- a/src/practice_files/practice_sqlalchemy/practice_aliased_subquery.py
+++ /dev/null
@@ -1,82 +0,0 @@
-from operator import concat
-
-from sqlalchemy import create_engine, inspect, select
-from sqlalchemy.orm import (
-    Query,
-    aliased,
-    column_property,
-    sessionmaker,
-    subqueryload,
-)
-
-from .model import (
-    Base,
-    Company,
-    CreditCard,
-    Car,
-    Human,
-    Ownership,
-    prepare_data,
-)
-
-
-def practice_annotation_(sess):
-    """annotation은 django 프레임워크의 ORM 쿼리함수인데, SQLAlchemy로 어떻게 번역해야 하는지에 대한 테스트를 수행"""
-    inspection = inspect(Car)
-
-    car_list_q = (
-        Query(concat(inspection.columns, [Human.name.label("owner")]))
-        .join(Car, Car.car_id == Ownership.car_id)
-        .subquery()
-    )
-
-    print(
-        list(
-            getattr(type("TempModel", tuple(), dict(t._asdict())), "owner")
-            for t in sess.query(car_list_q).all()
-        )
-    )
-    print([t._asdict() for t in sess.query(car_list_q).all()])
-    print(sess.query(Car).all())
-    stmt = sess.query(Human.name).label("owner")
-
-    print(
-        list(
-            map(
-                lambda c: c._asdict(),
-                sess.query(*inspection.columns, stmt).all(),
-            )
-        )
-    )
-
-
-def practice_prefetch_(sess):
-    humans = sess.query(Human).filter(Human.name == "wanda").subquery()
-    ownership = (
-        sess.query(Ownership)
-        .join(humans, humans.c.id_number == Ownership.human_id)
-        .subquery()
-    )
-    used_car = (
-        sess.query(Car)
-        .join(ownership, ownership.c.car_id == Car.car_id)
-        .subquery()
-    )
-    # makers = sess.query(Company).subquery()
-    car_list = sess.query(Company).join(used_car).first()
-
-    print(car_list)
-
-
-def main():
-    engine = create_engine("sqlite:///db.sqlite3", echo=True)
-
-    session_obj = sessionmaker(engine)
-
-    sess = session_obj()
-    practice_prefetch_(sess)
-
-
-if __name__ == "__main__":
-    # prepare_data()
-    main()
diff --git a/src/practice_files/practice_sqlalchemy/practice_db.py b/src/practice_files/practice_sqlalchemy/practice_db.py
deleted file mode 100644
index 1de93dc..0000000
--- a/src/practice_files/practice_sqlalchemy/practice_db.py
+++ /dev/null
@@ -1,46 +0,0 @@
-import sqlalchemy
-from datetime import datetime
-
-
-def main():
-    meta = sqlalchemy.MetaData()
-
-    engine = sqlalchemy.create_engine("sqlite://")
-
-    table_1 = sqlalchemy.Table(
-        "table_1",
-        meta,
-        sqlalchemy.Column(
-            "col_11", sqlalchemy.Integer, primary_key=True, autoincrement=True
-        ),
-        sqlalchemy.Column("col_12", sqlalchemy.String),
-        sqlalchemy.Column("col_13", sqlalchemy.DateTime, default=datetime.now),
-    )
-
-    table_2 = sqlalchemy.Table(
-        "table_2",
-        meta,
-        sqlalchemy.Column(
-            "col_21", sqlalchemy.Integer, primary_key=True, autoincrement=True
-        ),
-        sqlalchemy.Column("col_22", sqlalchemy.String),
-    )
-
-    meta.create_all(engine)
-
-    conn = engine.connect()
-
-    q = sqlalchemy.insert(table_1).values(col_12="value_1")
-    conn.execute(q)
-    q = sqlalchemy.insert(table_2).values(col_22="value_22")
-    conn.execute(q)
-
-    q = sqlalchemy.select([table_1, table_2])
-    rows = conn.execute(q)
-
-    for row in rows:
-        print(row)
-
-
-if __name__ == "__main__":
-    main()
diff --git a/src/practice_files/practice_sqlalchemy/practice_mocking_engine.py b/src/practice_files/practice_sqlalchemy/practice_mocking_engine.py
deleted file mode 100644
index 20de80f..0000000
--- a/src/practice_files/practice_sqlalchemy/practice_mocking_engine.py
+++ /dev/null
@@ -1,159 +0,0 @@
-from __future__ import annotations
-
-from contextlib import contextmanager
-import enum
-import os
-import logging
-
-from sqlalchemy import (
-    Column,
-    Enum,
-    ForeignKey,
-    Integer,
-    PrimaryKeyConstraint,
-    Text,
-    create_engine,
-)
-from sqlalchemy.engine import create_engine
-from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import relationship, sessionmaker
-
-import factory
-
-Base = declarative_base()
-
-
-"""
-   +-------+     +---+           +---------+
-   |Company| --> |Car| ----+---> |Ownership|
-   +-------+     +---+     |     +---------+
- +----------+     +-----+  |
- |CreditCard| --> |Human| -+
- +----------+     +-----+
-"""
-
-class CreditCard(Base):
-    __tablename__ = "credit_card"
-
-    card_id = Column(Integer, primary_key=True, autoincrement=True)
-    provider = Column(Text)
-    bounded = Column(Integer)
-
-    user = relationship("Human")
-
-
-class Company(Base):
-    __tablename__ = "company"
-
-    company_id = Column(Integer, autoincrement=True, primary_key=True)
-    name = Column(Text)
-    location = Column(Text)
-
-
-class CarType(str, enum.Enum):
-    gasoline = "gasoline"
-    electric = "electric"
-    hybrid_electric = "hybrid_electric"
-
-
-class Car(Base):
-    __tablename__ = "car"
-
-    car_id = Column(Integer, autoincrement=True, primary_key=True)
-    name = Column(Text)
-    drivetrain = Column(Enum(CarType))
-    maker_id = Column(Integer, ForeignKey(Company.company_id))
-    price = Column(Integer)
-
-
-class Human(Base):
-    __tablename__ = "human"
-
-    id_number = Column(Integer, primary_key=True, autoincrement=True)
-    name = Column(Text)
-    credit_card_id = Column(Integer, ForeignKey(CreditCard.card_id))
-
-
-class Ownership(Base):
-    __tablename__ = "ownership"
-
-    human_id = Column(Integer, ForeignKey(Human.id_number))
-    car_id = Column(Integer, ForeignKey(Car.car_id))
-    register_num = Column(Text, unique=True)
-
-    __table_args__ = (PrimaryKeyConstraint(human_id, car_id),)
-    
-def dump(sql, *multiparams, **params):
-    print(sql.compile(dialect=engine.dialect)) 
-    
-engine = create_engine('mysql+mysqlconnector://', executor=dump, strategy="mock")
-Base.metadata.create_all(engine, checkfirst=False)
-
-maker = sessionmaker(bind=engine)
-session = maker()
-    
-class FactoryCreditCard(factory.alchemy.SQLAlchemyModelFactory):
-    class Meta:
-        model = CreditCard
-        sqlalchemy_session = session
-    provider = "Samsung"
-    bounded = 500000
-
-class FactoryCompany(factory.alchemy.SQLAlchemyModelFactory):
-    class Meta:
-        model = Company
-        sqlalchemy_session = session
-    name = "Volkswagen"
-    location = "Germany"
-
-class FactoryCar(factory.alchemy.SQLAlchemyModelFactory):
-    class Meta:
-        model = Car
-        sqlalchemy_session = session
-    name = "Beetle"
-    drivetrain = "FWD"
-    maker_id = factory.RelatedFactory(FactoryCompany, factory_related_name="company_id")
-    price=250000
-
-class FactoryHuman(factory.alchemy.SQLAlchemyModelFactory):
-    class Meta:
-        model = Human
-        sqlalchemy_session = session
-    name = "Dick"
-    credit_card_id = factory.RelatedFactory(FactoryCreditCard, factory_related_name="card_id")
-    
-class FactoryOwnership(factory.alchemy.SQLAlchemyModelFactory):
-    class Meta:
-        model = Ownership
-        sqlalchemy_session = session
-    human_id = factory.RelatedFactory(FactoryHuman, factory_related_name="id_number")
-    car_id = factory.RelatedFactory(FactoryCar, factory_related_name="car_id")
-
-
-def query_example_model(engine):
-    pass
-    
-    
-def main():
-    logging.getLogger().setLevel(logging.DEBUG)
-    
-    FactoryCompany()
-    FactoryCar()
-
-    print(session.query(Car).all())
-    # print(session.query(CreditCard).all())
-    # for m in dir(session):
-    #     if m.startswith('_'):
-    #         continue
-    #     print(m, callable(getattr(session, m)))
-        
-    # print(dir(session.connection()))
-    # print(session.connection())
-    
-    # with get_test_session() as test_session:
-    
-    #     print(test_session)
-    #     print(dir(test_session))
-    
-if __name__ == '__main__':
-    main()
diff --git a/src/practice_files/practice_std_library/__init__.py b/src/practice_files/practice_std_library/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/practice_files/practice_algorithm/__init__.py b/src/practice_files/python/practice_algorithm/__init__.py
similarity index 100%
rename from src/practice_files/practice_algorithm/__init__.py
rename to src/practice_files/python/practice_algorithm/__init__.py
diff --git a/src/practice_files/practice_algorithm/combination.py b/src/practice_files/python/practice_algorithm/combination.py
similarity index 100%
rename from src/practice_files/practice_algorithm/combination.py
rename to src/practice_files/python/practice_algorithm/combination.py
diff --git a/src/practice_files/practice_algorithm/easy.py b/src/practice_files/python/practice_algorithm/easy.py
similarity index 100%
rename from src/practice_files/practice_algorithm/easy.py
rename to src/practice_files/python/practice_algorithm/easy.py
diff --git a/src/practice_files/practice_algorithm/graph.py b/src/practice_files/python/practice_algorithm/graph.py
similarity index 100%
rename from src/practice_files/practice_algorithm/graph.py
rename to src/practice_files/python/practice_algorithm/graph.py
diff --git a/src/practice_files/practice_algorithm/heap.py b/src/practice_files/python/practice_algorithm/heap.py
similarity index 100%
rename from src/practice_files/practice_algorithm/heap.py
rename to src/practice_files/python/practice_algorithm/heap.py
diff --git a/src/practice_files/practice_algorithm/make_crossword.py b/src/practice_files/python/practice_algorithm/make_crossword.py
similarity index 100%
rename from src/practice_files/practice_algorithm/make_crossword.py
rename to src/practice_files/python/practice_algorithm/make_crossword.py
diff --git a/src/practice_files/practice_algorithm/tree_avl.py b/src/practice_files/python/practice_algorithm/tree_avl.py
similarity index 100%
rename from src/practice_files/practice_algorithm/tree_avl.py
rename to src/practice_files/python/practice_algorithm/tree_avl.py
diff --git a/src/practice_files/practice_algorithm/tree_binary.py b/src/practice_files/python/practice_algorithm/tree_binary.py
similarity index 100%
rename from src/practice_files/practice_algorithm/tree_binary.py
rename to src/practice_files/python/practice_algorithm/tree_binary.py
diff --git a/src/practice_files/practice_builtins/__init__.py b/src/practice_files/python/practice_builtins/__init__.py
similarity index 100%
rename from src/practice_files/practice_builtins/__init__.py
rename to src/practice_files/python/practice_builtins/__init__.py
diff --git a/src/practice_files/practice_builtins/practice_args.py b/src/practice_files/python/practice_builtins/practice_args.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_args.py
rename to src/practice_files/python/practice_builtins/practice_args.py
diff --git a/src/practice_files/practice_builtins/practice_args_2.py b/src/practice_files/python/practice_builtins/practice_args_2.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_args_2.py
rename to src/practice_files/python/practice_builtins/practice_args_2.py
diff --git a/src/practice_files/practice_builtins/practice_asyncio.py b/src/practice_files/python/practice_builtins/practice_asyncio.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_asyncio.py
rename to src/practice_files/python/practice_builtins/practice_asyncio.py
diff --git a/src/practice_files/practice_builtins/practice_char.py b/src/practice_files/python/practice_builtins/practice_char.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_char.py
rename to src/practice_files/python/practice_builtins/practice_char.py
diff --git a/src/practice_files/practice_builtins/practice_dataclass.py b/src/practice_files/python/practice_builtins/practice_dataclass.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_dataclass.py
rename to src/practice_files/python/practice_builtins/practice_dataclass.py
diff --git a/src/practice_files/practice_builtins/practice_dataclass_conversion.py b/src/practice_files/python/practice_builtins/practice_dataclass_conversion.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_dataclass_conversion.py
rename to src/practice_files/python/practice_builtins/practice_dataclass_conversion.py
diff --git a/src/practice_files/practice_builtins/practice_dataclass_field.py b/src/practice_files/python/practice_builtins/practice_dataclass_field.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_dataclass_field.py
rename to src/practice_files/python/practice_builtins/practice_dataclass_field.py
diff --git a/src/practice_files/practice_builtins/practice_dataclass_from_dict.py b/src/practice_files/python/practice_builtins/practice_dataclass_from_dict.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_dataclass_from_dict.py
rename to src/practice_files/python/practice_builtins/practice_dataclass_from_dict.py
diff --git a/src/practice_files/practice_builtins/practice_dataclass_hierarchy.py b/src/practice_files/python/practice_builtins/practice_dataclass_hierarchy.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_dataclass_hierarchy.py
rename to src/practice_files/python/practice_builtins/practice_dataclass_hierarchy.py
diff --git a/src/practice_files/practice_builtins/practice_dataclass_kwargs.py b/src/practice_files/python/practice_builtins/practice_dataclass_kwargs.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_dataclass_kwargs.py
rename to src/practice_files/python/practice_builtins/practice_dataclass_kwargs.py
diff --git a/src/practice_files/practice_builtins/practice_enum.py b/src/practice_files/python/practice_builtins/practice_enum.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_enum.py
rename to src/practice_files/python/practice_builtins/practice_enum.py
diff --git a/src/practice_files/practice_builtins/practice_ex.py b/src/practice_files/python/practice_builtins/practice_ex.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_ex.py
rename to src/practice_files/python/practice_builtins/practice_ex.py
diff --git a/src/practice_files/practice_builtins/practice_exception.py b/src/practice_files/python/practice_builtins/practice_exception.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_exception.py
rename to src/practice_files/python/practice_builtins/practice_exception.py
diff --git a/src/practice_files/practice_builtins/practice_file.py b/src/practice_files/python/practice_builtins/practice_file.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_file.py
rename to src/practice_files/python/practice_builtins/practice_file.py
diff --git a/src/practice_files/practice_builtins/practice_file2.py b/src/practice_files/python/practice_builtins/practice_file2.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_file2.py
rename to src/practice_files/python/practice_builtins/practice_file2.py
diff --git a/src/practice_files/practice_builtins/practice_file_load.py b/src/practice_files/python/practice_builtins/practice_file_load.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_file_load.py
rename to src/practice_files/python/practice_builtins/practice_file_load.py
diff --git a/src/practice_files/practice_builtins/practice_inspect.py b/src/practice_files/python/practice_builtins/practice_inspect.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_inspect.py
rename to src/practice_files/python/practice_builtins/practice_inspect.py
diff --git a/src/practice_files/practice_builtins/practice_multiprocess.py b/src/practice_files/python/practice_builtins/practice_multiprocess.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_multiprocess.py
rename to src/practice_files/python/practice_builtins/practice_multiprocess.py
diff --git a/src/practice_files/practice_builtins/practice_namedtuple.py b/src/practice_files/python/practice_builtins/practice_namedtuple.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_namedtuple.py
rename to src/practice_files/python/practice_builtins/practice_namedtuple.py
diff --git a/src/practice_files/practice_builtins/practice_path.py b/src/practice_files/python/practice_builtins/practice_path.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_path.py
rename to src/practice_files/python/practice_builtins/practice_path.py
diff --git a/src/practice_files/practice_builtins/practice_type.py b/src/practice_files/python/practice_builtins/practice_type.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_type.py
rename to src/practice_files/python/practice_builtins/practice_type.py
diff --git a/src/practice_files/practice_builtins/practice_unicode.py b/src/practice_files/python/practice_builtins/practice_unicode.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_unicode.py
rename to src/practice_files/python/practice_builtins/practice_unicode.py
diff --git a/src/practice_files/practice_builtins/practice_urllib.py b/src/practice_files/python/practice_builtins/practice_urllib.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_urllib.py
rename to src/practice_files/python/practice_builtins/practice_urllib.py
diff --git a/src/practice_files/practice_builtins/practice_warning.py b/src/practice_files/python/practice_builtins/practice_warning.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_warning.py
rename to src/practice_files/python/practice_builtins/practice_warning.py
diff --git a/src/practice_files/practice_builtins/practice_weakref.py b/src/practice_files/python/practice_builtins/practice_weakref.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_weakref.py
rename to src/practice_files/python/practice_builtins/practice_weakref.py
diff --git a/src/practice_files/practice_builtins/practice_xml.py b/src/practice_files/python/practice_builtins/practice_xml.py
similarity index 100%
rename from src/practice_files/practice_builtins/practice_xml.py
rename to src/practice_files/python/practice_builtins/practice_xml.py
diff --git a/src/practice_files/practice_circular_import/__init__.py b/src/practice_files/python/practice_circular_import/__init__.py
similarity index 100%
rename from src/practice_files/practice_circular_import/__init__.py
rename to src/practice_files/python/practice_circular_import/__init__.py
diff --git a/src/practice_files/practice_circular_import/main.py b/src/practice_files/python/practice_circular_import/main.py
similarity index 100%
rename from src/practice_files/practice_circular_import/main.py
rename to src/practice_files/python/practice_circular_import/main.py
diff --git a/src/practice_files/practice_circular_import/package_a.py b/src/practice_files/python/practice_circular_import/package_a.py
similarity index 100%
rename from src/practice_files/practice_circular_import/package_a.py
rename to src/practice_files/python/practice_circular_import/package_a.py
diff --git a/src/practice_files/practice_circular_import/package_b.py b/src/practice_files/python/practice_circular_import/package_b.py
similarity index 100%
rename from src/practice_files/practice_circular_import/package_b.py
rename to src/practice_files/python/practice_circular_import/package_b.py
diff --git a/src/practice_files/practice_circular_import/package_c.py b/src/practice_files/python/practice_circular_import/package_c.py
similarity index 100%
rename from src/practice_files/practice_circular_import/package_c.py
rename to src/practice_files/python/practice_circular_import/package_c.py
diff --git a/src/practice_files/practice_cpython/CMakeLists.txt b/src/practice_files/python/practice_cpython/CMakeLists.txt
similarity index 100%
rename from src/practice_files/practice_cpython/CMakeLists.txt
rename to src/practice_files/python/practice_cpython/CMakeLists.txt
diff --git a/src/practice_files/practice_cpython/practice_types.c b/src/practice_files/python/practice_cpython/practice_types.c
similarity index 100%
rename from src/practice_files/practice_cpython/practice_types.c
rename to src/practice_files/python/practice_cpython/practice_types.c
diff --git a/src/practice_files/practice_cpython/practice_types.py b/src/practice_files/python/practice_cpython/practice_types.py
similarity index 100%
rename from src/practice_files/practice_cpython/practice_types.py
rename to src/practice_files/python/practice_cpython/practice_types.py
diff --git a/src/practice_files/practice_decorator/__init__.py b/src/practice_files/python/practice_decorator/__init__.py
similarity index 100%
rename from src/practice_files/practice_decorator/__init__.py
rename to src/practice_files/python/practice_decorator/__init__.py
diff --git a/src/practice_files/practice_decorator/practice_deco.py b/src/practice_files/python/practice_decorator/practice_deco.py
similarity index 100%
rename from src/practice_files/practice_decorator/practice_deco.py
rename to src/practice_files/python/practice_decorator/practice_deco.py
diff --git a/src/practice_files/practice_decorator/practice_deco2.py b/src/practice_files/python/practice_decorator/practice_deco2.py
similarity index 100%
rename from src/practice_files/practice_decorator/practice_deco2.py
rename to src/practice_files/python/practice_decorator/practice_deco2.py
diff --git a/src/practice_files/practice_decorator/practice_deco3.py b/src/practice_files/python/practice_decorator/practice_deco3.py
similarity index 100%
rename from src/practice_files/practice_decorator/practice_deco3.py
rename to src/practice_files/python/practice_decorator/practice_deco3.py
diff --git a/src/practice_files/practice_decorator/practice_deco4.py b/src/practice_files/python/practice_decorator/practice_deco4.py
similarity index 100%
rename from src/practice_files/practice_decorator/practice_deco4.py
rename to src/practice_files/python/practice_decorator/practice_deco4.py
diff --git a/src/practice_files/practice_decorator/practice_deco_args.py b/src/practice_files/python/practice_decorator/practice_deco_args.py
similarity index 100%
rename from src/practice_files/practice_decorator/practice_deco_args.py
rename to src/practice_files/python/practice_decorator/practice_deco_args.py
diff --git a/src/practice_files/practice_decorator/practice_decorator_using_html.py b/src/practice_files/python/practice_decorator/practice_decorator_using_html.py
similarity index 100%
rename from src/practice_files/practice_decorator/practice_decorator_using_html.py
rename to src/practice_files/python/practice_decorator/practice_decorator_using_html.py
diff --git a/src/practice_files/practice_func/__init__.py b/src/practice_files/python/practice_func/__init__.py
similarity index 100%
rename from src/practice_files/practice_func/__init__.py
rename to src/practice_files/python/practice_func/__init__.py
diff --git a/src/practice_files/practice_func/practice_attr.py b/src/practice_files/python/practice_func/practice_attr.py
similarity index 100%
rename from src/practice_files/practice_func/practice_attr.py
rename to src/practice_files/python/practice_func/practice_attr.py
diff --git a/src/practice_files/practice_func/practice_attr_2.py b/src/practice_files/python/practice_func/practice_attr_2.py
similarity index 100%
rename from src/practice_files/practice_func/practice_attr_2.py
rename to src/practice_files/python/practice_func/practice_attr_2.py
diff --git a/src/practice_files/practice_func/practice_compisite.py b/src/practice_files/python/practice_func/practice_compisite.py
similarity index 98%
rename from src/practice_files/practice_func/practice_compisite.py
rename to src/practice_files/python/practice_func/practice_compisite.py
index 993a14a..e53a7b4 100644
--- a/src/practice_files/practice_func/practice_compisite.py
+++ b/src/practice_files/python/practice_func/practice_compisite.py
@@ -19,8 +19,6 @@ def composite_funcs(*funcs: Callable) -> Callable:
     # return reduce(lambda f, g: (lambda x: f(g(x))), funcs)
     # msg = ",".join(["{}".format(func.__name__) for func in funcs])
     # logging.debug(msg)
-    logging.debug(funcs[0].__name__)
-
     # func = lambda x: funcs[0](composite_funcs(*funcs[1:])(x)) if len(funcs) > 1 else funcs[0]
 
     # return lambda x: funcs[0](composite_funcs(*funcs[1:])(x)) if len(funcs) > 1 else funcs[0]
diff --git a/src/practice_files/practice_func/practice_yield.py b/src/practice_files/python/practice_func/practice_yield.py
similarity index 100%
rename from src/practice_files/practice_func/practice_yield.py
rename to src/practice_files/python/practice_func/practice_yield.py
diff --git a/src/practice_files/practice_image/__init__.py b/src/practice_files/python/practice_logging/__init__.py
similarity index 100%
rename from src/practice_files/practice_image/__init__.py
rename to src/practice_files/python/practice_logging/__init__.py
diff --git a/src/practice_files/practice_logging/config.py b/src/practice_files/python/practice_logging/config.py
similarity index 100%
rename from src/practice_files/practice_logging/config.py
rename to src/practice_files/python/practice_logging/config.py
diff --git a/src/practice_files/practice_logging/practice_accept_log_yaml.py b/src/practice_files/python/practice_logging/practice_accept_log_yaml.py
similarity index 100%
rename from src/practice_files/practice_logging/practice_accept_log_yaml.py
rename to src/practice_files/python/practice_logging/practice_accept_log_yaml.py
diff --git a/src/practice_files/practice_logging/practice_log_server.py b/src/practice_files/python/practice_logging/practice_log_server.py
similarity index 100%
rename from src/practice_files/practice_logging/practice_log_server.py
rename to src/practice_files/python/practice_logging/practice_log_server.py
diff --git a/src/practice_files/practice_logging/practice_logging.py b/src/practice_files/python/practice_logging/practice_logging.py
similarity index 100%
rename from src/practice_files/practice_logging/practice_logging.py
rename to src/practice_files/python/practice_logging/practice_logging.py
diff --git a/src/practice_files/practice_logging/python_log_conf.yml b/src/practice_files/python/practice_logging/python_log_conf.yml
similarity index 100%
rename from src/practice_files/practice_logging/python_log_conf.yml
rename to src/practice_files/python/practice_logging/python_log_conf.yml
diff --git a/src/practice_files/practice_module/__init__.py b/src/practice_files/python/practice_module/__init__.py
similarity index 100%
rename from src/practice_files/practice_module/__init__.py
rename to src/practice_files/python/practice_module/__init__.py
diff --git a/src/practice_files/practice_module/module1.py b/src/practice_files/python/practice_module/module1.py
similarity index 100%
rename from src/practice_files/practice_module/module1.py
rename to src/practice_files/python/practice_module/module1.py
diff --git a/src/practice_files/practice_module/practice_functional_import.py b/src/practice_files/python/practice_module/practice_functional_import.py
similarity index 100%
rename from src/practice_files/practice_module/practice_functional_import.py
rename to src/practice_files/python/practice_module/practice_functional_import.py
diff --git a/src/practice_files/practice_module/practice_import.py b/src/practice_files/python/practice_module/practice_import.py
similarity index 100%
rename from src/practice_files/practice_module/practice_import.py
rename to src/practice_files/python/practice_module/practice_import.py
diff --git a/src/practice_files/practice_module/practice_import2.py b/src/practice_files/python/practice_module/practice_import2.py
similarity index 100%
rename from src/practice_files/practice_module/practice_import2.py
rename to src/practice_files/python/practice_module/practice_import2.py
diff --git a/src/practice_files/practice_module/practice_import_loader_by_files.py b/src/practice_files/python/practice_module/practice_import_loader_by_files.py
similarity index 100%
rename from src/practice_files/practice_module/practice_import_loader_by_files.py
rename to src/practice_files/python/practice_module/practice_import_loader_by_files.py
diff --git a/src/practice_files/practice_module/practice_module_name.py b/src/practice_files/python/practice_module/practice_module_name.py
similarity index 100%
rename from src/practice_files/practice_module/practice_module_name.py
rename to src/practice_files/python/practice_module/practice_module_name.py
diff --git a/src/practice_files/practice_module/practice_module_test.py b/src/practice_files/python/practice_module/practice_module_test.py
similarity index 100%
rename from src/practice_files/practice_module/practice_module_test.py
rename to src/practice_files/python/practice_module/practice_module_test.py
diff --git a/src/practice_files/practice_module/practice_module_test2.py b/src/practice_files/python/practice_module/practice_module_test2.py
similarity index 100%
rename from src/practice_files/practice_module/practice_module_test2.py
rename to src/practice_files/python/practice_module/practice_module_test2.py
diff --git a/src/practice_files/practice_module/practice_pkg.py b/src/practice_files/python/practice_module/practice_pkg.py
similarity index 100%
rename from src/practice_files/practice_module/practice_pkg.py
rename to src/practice_files/python/practice_module/practice_pkg.py
diff --git a/src/practice_files/practice_module/practice_pkg_2.py b/src/practice_files/python/practice_module/practice_pkg_2.py
similarity index 100%
rename from src/practice_files/practice_module/practice_pkg_2.py
rename to src/practice_files/python/practice_module/practice_pkg_2.py
diff --git a/src/practice_files/practice_module/practice_runtime_code_load.py b/src/practice_files/python/practice_module/practice_runtime_code_load.py
similarity index 100%
rename from src/practice_files/practice_module/practice_runtime_code_load.py
rename to src/practice_files/python/practice_module/practice_runtime_code_load.py
diff --git a/src/practice_files/practice_logging/__init__.py b/src/practice_files/python/practice_pattern/__init__.py
similarity index 100%
rename from src/practice_files/practice_logging/__init__.py
rename to src/practice_files/python/practice_pattern/__init__.py
diff --git a/src/practice_files/practice_pattern/practice_singleton.py b/src/practice_files/python/practice_pattern/practice_singleton.py
similarity index 100%
rename from src/practice_files/practice_pattern/practice_singleton.py
rename to src/practice_files/python/practice_pattern/practice_singleton.py
diff --git a/src/practice_files/practice_pattern/practice_state_machine.py b/src/practice_files/python/practice_pattern/practice_state_machine.py
similarity index 100%
rename from src/practice_files/practice_pattern/practice_state_machine.py
rename to src/practice_files/python/practice_pattern/practice_state_machine.py
diff --git a/src/practice_files/practice_media/__init__.py b/src/practice_files/python/practice_python/__init__.py
similarity index 100%
rename from src/practice_files/practice_media/__init__.py
rename to src/practice_files/python/practice_python/__init__.py
diff --git a/src/practice_files/practice_python/practice_class.py b/src/practice_files/python/practice_python/practice_class.py
similarity index 100%
rename from src/practice_files/practice_python/practice_class.py
rename to src/practice_files/python/practice_python/practice_class.py
diff --git a/src/practice_files/practice_python/practice_class_hierarchy.py b/src/practice_files/python/practice_python/practice_class_hierarchy.py
similarity index 100%
rename from src/practice_files/practice_python/practice_class_hierarchy.py
rename to src/practice_files/python/practice_python/practice_class_hierarchy.py
diff --git a/src/practice_files/practice_python/practice_create_fn.py b/src/practice_files/python/practice_python/practice_create_fn.py
similarity index 100%
rename from src/practice_files/practice_python/practice_create_fn.py
rename to src/practice_files/python/practice_python/practice_create_fn.py
diff --git a/src/practice_files/practice_python/practice_csv.py b/src/practice_files/python/practice_python/practice_csv.py
similarity index 100%
rename from src/practice_files/practice_python/practice_csv.py
rename to src/practice_files/python/practice_python/practice_csv.py
diff --git a/src/practice_files/practice_python/practice_dict.py b/src/practice_files/python/practice_python/practice_dict.py
similarity index 100%
rename from src/practice_files/practice_python/practice_dict.py
rename to src/practice_files/python/practice_python/practice_dict.py
diff --git a/src/practice_files/practice_python/practice_enum.py b/src/practice_files/python/practice_python/practice_enum.py
similarity index 100%
rename from src/practice_files/practice_python/practice_enum.py
rename to src/practice_files/python/practice_python/practice_enum.py
diff --git a/src/practice_files/practice_python/practice_enum_class_hierarchy.py b/src/practice_files/python/practice_python/practice_enum_class_hierarchy.py
similarity index 100%
rename from src/practice_files/practice_python/practice_enum_class_hierarchy.py
rename to src/practice_files/python/practice_python/practice_enum_class_hierarchy.py
diff --git a/src/practice_files/practice_python/practice_func.py b/src/practice_files/python/practice_python/practice_func.py
similarity index 100%
rename from src/practice_files/practice_python/practice_func.py
rename to src/practice_files/python/practice_python/practice_func.py
diff --git a/src/practice_files/practice_python/practice_list.py b/src/practice_files/python/practice_python/practice_list.py
similarity index 100%
rename from src/practice_files/practice_python/practice_list.py
rename to src/practice_files/python/practice_python/practice_list.py
diff --git a/src/practice_files/practice_python/practice_loop.py b/src/practice_files/python/practice_python/practice_loop.py
similarity index 100%
rename from src/practice_files/practice_python/practice_loop.py
rename to src/practice_files/python/practice_python/practice_loop.py
diff --git a/src/practice_files/practice_python/practice_obj.py b/src/practice_files/python/practice_python/practice_obj.py
similarity index 100%
rename from src/practice_files/practice_python/practice_obj.py
rename to src/practice_files/python/practice_python/practice_obj.py
diff --git a/src/practice_files/practice_python/practice_set.py b/src/practice_files/python/practice_python/practice_set.py
similarity index 100%
rename from src/practice_files/practice_python/practice_set.py
rename to src/practice_files/python/practice_python/practice_set.py
diff --git a/src/practice_files/practice_python/practice_typehint.py b/src/practice_files/python/practice_python/practice_typehint.py
similarity index 100%
rename from src/practice_files/practice_python/practice_typehint.py
rename to src/practice_files/python/practice_python/practice_typehint.py
diff --git a/src/practice_files/practice_python/test.csv b/src/practice_files/python/practice_python/test.csv
similarity index 100%
rename from src/practice_files/practice_python/test.csv
rename to src/practice_files/python/practice_python/test.csv
diff --git a/src/practice_files/practice_serialize/practice_pickle.py b/src/practice_files/python/practice_serialize/practice_pickle.py
similarity index 100%
rename from src/practice_files/practice_serialize/practice_pickle.py
rename to src/practice_files/python/practice_serialize/practice_pickle.py
diff --git a/src/practice_files/practice_pattern/__init__.py b/src/practice_files/python/practice_std_library/__init__.py
similarity index 100%
rename from src/practice_files/practice_pattern/__init__.py
rename to src/practice_files/python/practice_std_library/__init__.py
diff --git a/src/practice_files/practice_std_library/practice_audithook.py b/src/practice_files/python/practice_std_library/practice_audithook.py
similarity index 100%
rename from src/practice_files/practice_std_library/practice_audithook.py
rename to src/practice_files/python/practice_std_library/practice_audithook.py
diff --git a/src/practice_files/practice_std_library/practice_fibo.py b/src/practice_files/python/practice_std_library/practice_fibo.py
similarity index 100%
rename from src/practice_files/practice_std_library/practice_fibo.py
rename to src/practice_files/python/practice_std_library/practice_fibo.py
diff --git a/src/practice_files/practice_std_library/practice_func.py b/src/practice_files/python/practice_std_library/practice_func.py
similarity index 100%
rename from src/practice_files/practice_std_library/practice_func.py
rename to src/practice_files/python/practice_std_library/practice_func.py
diff --git a/src/practice_files/practice_std_library/practice_named_enum.py b/src/practice_files/python/practice_std_library/practice_named_enum.py
similarity index 100%
rename from src/practice_files/practice_std_library/practice_named_enum.py
rename to src/practice_files/python/practice_std_library/practice_named_enum.py
diff --git a/src/practice_files/practice_string/practice_extract.py b/src/practice_files/python/practice_string/practice_extract.py
similarity index 100%
rename from src/practice_files/practice_string/practice_extract.py
rename to src/practice_files/python/practice_string/practice_extract.py
diff --git a/src/practice_files/practice_string/practice_unicode.py b/src/practice_files/python/practice_string/practice_unicode.py
similarity index 100%
rename from src/practice_files/practice_string/practice_unicode.py
rename to src/practice_files/python/practice_string/practice_unicode.py
diff --git a/src/practice_files/practice_string/text_output.txt b/src/practice_files/python/practice_string/text_output.txt
similarity index 100%
rename from src/practice_files/practice_string/text_output.txt
rename to src/practice_files/python/practice_string/text_output.txt
diff --git a/src/practice_files/practice_string/text_unicode.txt b/src/practice_files/python/practice_string/text_unicode.txt
similarity index 100%
rename from src/practice_files/practice_string/text_unicode.txt
rename to src/practice_files/python/practice_string/text_unicode.txt
diff --git a/src/practice_files/practice_subprocess/popen_runner.py b/src/practice_files/python/practice_subprocess/popen_runner.py
similarity index 100%
rename from src/practice_files/practice_subprocess/popen_runner.py
rename to src/practice_files/python/practice_subprocess/popen_runner.py
diff --git a/src/practice_files/practice_subprocess/practice_popen.py b/src/practice_files/python/practice_subprocess/practice_popen.py
similarity index 100%
rename from src/practice_files/practice_subprocess/practice_popen.py
rename to src/practice_files/python/practice_subprocess/practice_popen.py
diff --git a/src/practice_files/practice_python/__init__.py b/src/practice_files/python/practice_typing/__init__.py
similarity index 100%
rename from src/practice_files/practice_python/__init__.py
rename to src/practice_files/python/practice_typing/__init__.py
diff --git a/src/practice_files/python/practice_typing/practice_cast.py b/src/practice_files/python/practice_typing/practice_cast.py
new file mode 100644
index 0000000..b7dd006
--- /dev/null
+++ b/src/practice_files/python/practice_typing/practice_cast.py
@@ -0,0 +1,46 @@
+"""
+typing.cast 
+
+Practice for typing.cast to try type casting for instance to child class.
+Actually, it does not works. `cast` should be read for semantic word, declaration.
+"""
+from typing import cast
+
+
+class ACls:
+    x: int
+    y: int
+    z: int
+
+    def __init__(self, x=0, y=1, z=2) -> None:
+        self.x = x
+        self.y = y
+        self.z = z
+    
+    def __str__(self):
+        return f"<class {self.__class__.__name__} " + " ".join([f"{k}={v}" for k,v in self.__dict__.items() if not k.startswith("_")]) +">"
+    
+class BCls(ACls):
+    a: str
+    b: str
+    c: str
+
+    def __init__(self, a="a", b="b", c="c", *, x=0, y=1, z=2):
+        super().__init__(x, y, z)
+        self.a = a
+        self.b = b
+        self.c = c
+
+
+def runner():
+    a = ACls(1,2,3)
+
+    print(type(a), a)  # <class '__main__.ACls'> <class ACls x=1 y=2 z=3>
+
+    b = cast(BCls, a)  # Just declare type to BCls for variable `a`. It does not means of really converting to BCls.
+
+    print(type(b), b)  # <class '__main__.ACls'> <class ACls x=1 y=2 z=3>
+
+
+if __name__ == "__main__":
+    runner()
diff --git a/src/practice_files/practice_typing/practice_protocol.py b/src/practice_files/python/practice_typing/practice_protocol.py
similarity index 100%
rename from src/practice_files/practice_typing/practice_protocol.py
rename to src/practice_files/python/practice_typing/practice_protocol.py
diff --git a/src/practice_files/practice_redis/__init__.py b/src/practice_files/python/weakref/__init__.py
similarity index 100%
rename from src/practice_files/practice_redis/__init__.py
rename to src/practice_files/python/weakref/__init__.py
diff --git a/src/practice_files/python/weakref/practice_weakref.py b/src/practice_files/python/weakref/practice_weakref.py
new file mode 100644
index 0000000..e281e68
--- /dev/null
+++ b/src/practice_files/python/weakref/practice_weakref.py
@@ -0,0 +1,35 @@
+"""
+weakref with dataclass
+
+Practice to add attribute for reference type.
+  - Not support the attribute type of ReferenceType for BaseModel, dataclass in pydantic
+  - Available to add the attribute type of ReferenceType for dataclass(basic library)
+"""
+from weakref import ref, ReferenceType
+# from pydantic import BaseModel, Field
+# from pydantic.dataclasses import dataclass
+from dataclasses import dataclass, field, asdict
+from typing import Optional, Any, ForwardRef
+
+
+@dataclass
+class Object:
+    field: str = field(default="", kw_only=True)
+
+@dataclass
+class SuperObject:
+    obj: ReferenceType[Object]
+
+o = Object(field="abc")
+r = ref(o)
+
+so = SuperObject(obj = ref(o))
+
+print(so)
+print(so.obj, so.obj())
+print(id(so.obj()), id(o))
+
+print(o.field, so.obj().field)
+
+o.field = "xyz"
+print(so.obj().field)