Method __init__

Lib/test/test_pprint.py:706–707

(self, keys=None)

        """Test that mapping ABC views use their ._mapping's __repr__."""
        class MyMapping(Mapping):
            def __init__(self, keys=None):
                self._keys = {} if keys is None else dict.fromkeys(keys)

            def __getitem__(self, item):
                return self._keys[item]