Modified str to int: on old_files/readme.md

[Sananda-Dutta]

fixes #792

Description what was the issue
There was a problem of str to int example Where the str with a decimal number is shown to be directly converted to int without any error, But that was a mistake.

Screenshot

How I solved
I converted the str to float datatype first then converting the float to int. so it doesn't cause any error.

Code

num_str = '10.6'

num_float = float(num_str)   # Convert the string to float
num_int = int(num_float)     # Convert float to integer

print('num_int', num_int)        # 10
print('num_float', num_float)    # 10.6