Python中的Docopt模块

pip install docopt

""" Usage: simple_program.py 

Print the contents of the file to the console.
"""

from docopt import docopt

def main():
   args = docopt(__doc__)
   filename = args['']
   with open(filename, 'r') as f:
      print(f.read())

if __name__ == '__main__':
   main()

This is testing the docopt module.

"""Usage: program_with_options.py [--line-numbers] 

Print the contents of the file to the console, with line numbers if specified.

Options:
  --line-numbers  Display line numbers.
"""

from docopt import docopt

def main():
   args = docopt(__doc__)
   filename = args['']
   with open(filename, 'r') as f:
      if args['--line-numbers']:
         for i, line in enumerate(f):
            print(f"{i+1}: {line}", end="")
      else:
         print(f.read())

if __name__ == '__main__':
    main()

1: This is testing the docopt module.
2: This is line 2
3: This is line 3
4: This is line 4