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def func(a,b, *c):
    pass
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def func(**args):
    print('arg len %d' % len(args))
    if 'proxy' in args:
        print('proxy: %s' % args['proxy'])
       
if __name__=='__main__':
    func(proxy='no')
    func()
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arg len 1
proxy: no
arg len 0


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