class DummyMapping:
    """
    Dummy object used to provide a mapping interface for singular values.
    """
    def __init__(self, value):
        self._value = value

    def __getitem__(self, key):
        return self._value

class DummyMapping:
    """
    Dummy object used to provide a mapping interface for singular values.
    """
    def __init__(self, value):
        self._value = value

    def __getitem__(self, key):
        return self._value

Dummy object used to provide a mapping interface for singular values.