File Browser

import os
import argparse
import sys

defls(directory='.', show_hidden=False, human_readable=False):
 file_list = os.listdir(directory)
 file_list.sort()

ifnot show_hidden:
 file_list =[f for f in file_list ifnot f.startswith('.')]

if human_readable:
 file_list =[(f, get_human_readable_size(os.path.join(directory, f)))for f in file_list]
forfile, size in file_list:
print(f"{file}\t{size}")
else:
forfilein file_list:
print(file)

defget_human_readable_size(file_path):
 size = os.path.getsize(file_path)
 units =['B','KB','MB','GB','TB']
 index =0
while size >=1024and index <len(units)-1:
 size /=1024
 index +=1
returnf"{size:.2f}{units[index]}"

defmain():
 parser = argparse.ArgumentParser(description='List files in a directory.')
 parser.add_argument('-a','--all', action='store_true',help='Include hidden files')
 parser.add_argument('-w','--human-readable', action='store_true',help='Display file sizes in human-readable format')
 args = parser.parse_args()

 ls(directory='.', show_hidden=args.all, human_readable=args.human_readable)

if __name__ =='__main__':
 main()

In Python, each .py file is a Python module. Except for the application entry module, other modules usually cannot be run directly. However, for convenience of testing, the following code is often written to provide a testing interface for the module:

if __name__ == '__main__':
 main()

This means that when running the script directly using the Python command, the code in the main function will be executed. When the script is imported as a module by other modules, the main function will not be executed.

python ls.py 

python ls.py -w

python ls.py -a

python ls.py -aw