assert_contains: Is every value in nested data structure p at the same path in f?

assert_contains.py

def assert_contains(full, partial):
    """Is every value in nested data structure p at the same path in f?"""
    assert isinstance(full, type(partial)), '{} != {}'.format(full, partial)
    if isinstance(partial, dict):
        for k, v in partial.items():
            assert k in full, "No key '{}' in {}".format(k, dict(full))
            assert_contains(full[k], v)
        return True
    if isinstance(partial, (list, tuple)):
        for i, partial_item in enumerate(partial):
            assert_contains(full[i], partial_item)
        return True
    assert full == partial, '{} != {}'.format(full, partial)
    return True