Map command line arguments to function arguments in python

easyarg.py

import sys

def foo(*args, **kwargs):
    argstr = list(map(repr, args))
    kwargstr = [f'{key}={repr(value)}' for key, value in kwargs.items()]
    print("foo(", ", ".join(argstr + kwargstr), ")", sep="")

def easyarg(f):
    opts = {}
    for i in range(1, len(sys.argv)):
        arg = sys.argv[i]
        if arg == '--':
            return f(*sys.argv[i+1:], **opts)
        elif arg.startswith('--'):
            eqpos = arg.find('=')
            if eqpos >= 0:
                key = arg[2:eqpos]
                value = arg[eqpos+1:]
            else:
                key = arg[2:]
                value = True
            opts[key] = value
        else:
            return f(*sys.argv[i:], **opts)
    return f(*sys.argv[1:])

if __name__ == '__main__':
    easyarg(foo)

"""
$ python3 easyarg.py --start=5 -- --a b c                                                                                                          TSTP ✘  1m 3s  ≡
foo('--a', 'b', 'c', start='5')
"""