implement ls command

Author: Fatma Degirmenci

implement-shell-tools/ls/ls.py

@@ -0,0 +1,20 @@
+import argparse
+import os 
+parser=argparse.ArgumentParser(description="ls command")
+parser.add_argument("-1",dest="one_per_line",action="store_true",help="List one file per line")
+parser.add_argument("-a",dest="all", action="store_true",help="Include hidden files")
+parser.add_argument("path", nargs="?", default=".", help="Directory to list")
+
+args=parser.parse_args()
+files=os.listdir(args.path)
+if not args.all:
+    new_files=[]
+    for f in files:
+        if not f.startswith("."):
+            new_files.append(f)
+    files=new_files    
+if args.one_per_line:
+    for f in files:
+        print(f)
+else:
+    print(" ".join(files))