Python编程编写完善的命令行工具

import fire
def hello(name="World"):
  return "Hello %s!" % name
if __name__ == '__main__':
  fire.Fire(hello)
 

python hello.py  # Hello World!
python hello.py --name=David  # Hello David!
python hello.py --help  # Shows usage information.

import fire
class Calculator(object):
  """A simple calculator class."""
  def double(self, number):
    return 2 * number
if __name__ == '__main__':
  fire.Fire(Calculator)

python calculator.py double 10  # 20
python calculator.py double --number=15  # 30

from mando import command, main
@command
def echo(text, capitalize=False):
    '''Echo the given text.'''
    if capitalize:
        text = text.upper()
    print(text)
if __name__ == '__main__':
    main()
 

$ python example.py -h
usage: example.py [-h] {echo} ...
positional arguments:
  {echo}
    echo      Echo the given text.
optional arguments:
  -h, --help  show this help message and exit
$ python example.py echo -h
usage: example.py echo [-h] [--capitalize] text
Echo the given text.
positional arguments:
  text
optional arguments:
  -h, --help    show this help message and exit
  --capitalize
 

$ python example.py echo spam
spam
$ python example.py echo --capitalize spam
SPAM

from mando import command, main
@command
def push(repository, all=False, dry_run=False, force=False, thin=False):
    '''Update remote refs along with associated objects.
    :param repository: Repository to push to.
    :param --all: Push all refs.
    :param -n, --dry-run: Dry run.
    :param -f, --force: Force updates.
    :param --thin: Use thin pack.'''
     print ('Pushing to {0}. All: {1}, dry run: {2}, force: {3}, thin: {4}'
           .format(repository, all, dry_run, force, thin))
if __name__ == '__main__':
    main()
  

$ python git.py push -h
usage: git.py push [-h] [--all] [-n] [-f] [--thin] repository
Update remote refs along with associated objects. 
positional arguments:
  repository     Repository to push to.
optional arguments:
  -h, --help     show this help message and exit
  --all          Push all refs.
  -n, --dry-run  Dry run.
  -f, --force    Force updates.
  --thin         Use thin pack.
  
 

from mando import command, main
@command
def duplicate(string, times: int):
    '''Duplicate text.
    :param string: The text to duplicate.
    :param times: How many times to duplicate.'''
    print(string * times)
if __name__ == '__main__':
    main()
 

$ python3 test.py duplicate "test " 5
test test test test test
$ python3 test.py duplicate "test " foo
usage: test.py duplicate [-h] string times
test.py duplicate: error: argument times: invalid int value: 'foo'