@classmethod
    def fromkeys(cls, iterable, value=None):
        d = cls()
        for key in iterable:
            d[key] = value
        return d
Test one parameter given to ifchanged.
dataset/ETHPy150Open baseblack/ReproWeb/3rdParty/python/ordereddict.py/OrderedDict.fromkeys--crossover with--dataset/ETHPy150Open django/django/tests/template_tests/syntax_tests/test_if_changed.py/IfChangedTagTests.test_ifchanged_param01