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import argparse
import sys

def check_dependence(kwargs):
    print 'Tool: {kwargs.tool}\nValues: {kwargs.values}\n'.format(kwargs=kwargs)
    if kwargs.tool:
        if not kwargs.values:
            print 'No values!\n'
        else:
            # do some stuff with kwargs.values
            print 'OK\n'
    else:
        if kwargs.values:
            print 'No tool!\n'

def main(args):
    p = argparse.ArgumentParser('My Tool')
    p.add_argument('--tool', nargs='+')
    p.add_argument('--values', nargs='+')
    check_dependence(p.parse_args(args))


if __name__ == '__main__':
    main(sys.argv[1:])

Code: Alles auswählen

$ python ./depend_arg.py --tool /path/to/tool
Tool: ['/path/to/tool']
Values: None

No values!

$ python ./depend_arg.py --values one two three
Tool: None
Values: ['one', 'two', 'three']

No tool!

$ python ./depend_arg.py --tool /path/to/tool --values one two three
Tool: ['/path/to/tool']
Values: ['one', 'two', 'three']

OK