1 2def test(**kw): 3 """ 4 >>> d = {1 : 2} 5 >>> test(**d) # doctest: +ELLIPSIS 6 Traceback (most recent call last): 7 TypeError: ...keywords must be strings 8 >>> d 9 {1: 2} 10 >>> d = {} 11 >>> test(**d) 12 {'arg': 3} 13 >>> d 14 {} 15 >>> d = {'arg' : 2} 16 >>> test(**d) 17 {'arg': 3} 18 >>> d 19 {'arg': 2} 20 """ 21 kw['arg'] = 3 22 return kw 23