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File Browser


The ls command is a powerful file viewing command in Linux.

Please implement a similar command-line tool in Python. It should support the following command-line options:

  • -a or --all: Include hidden files in the file list.
  • -w or --human-readable: Display file sizes in a human-readable format.
  • -h or --help: Display help information.

Python implementation
import os
import argparse
import sys

def ls(directory='.', show_hidden=False, human_readable=False):
file_list = os.listdir(directory)

if not show_hidden:
file_list = [f for f in file_list if not f.startswith('.')]

if human_readable:
file_list = [(f, get_human_readable_size(os.path.join(directory, f))) for f in file_list]
for file, size in file_list:
for file in file_list:

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

def main():
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__':
What is __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__':

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.


List files
Display file sizes in a human-readable format
python -w
Display all files
python -a
Combine options
python -aw