File: fun_calldblstar3.py

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# test passing a user-defined mapping as the argument to **

def foo(**kw):
    print(sorted(kw.items()))

class Mapping:
    def keys(self):
        # the long string checks the case of string interning
        return ['a', 'b', 'c', 'abcdefghijklmnopqrst']

    def __getitem__(self, key):
        if key == 'a':
            return 1
        else:
            return 2

foo(**Mapping())