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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _VerifyMethodCall(self):
 """Verify the called method is expected. This can be an ordered method, or part of an unordered set. Returns: The expected mock method. Raises: UnexpectedMethodCall if the method called was not expected. """


    expected = self._PopNextMethod()

    # Loop here, because we might have a MethodGroup followed by another
    # group.
    while isinstance(expected, MethodGroup):
      expected, method = expected.MethodCalled(self)
      if method is not None:
        return method

    # This is a mock method, so just check equality.
    if expected != self:
      raise UnexpectedMethodCallError(self, expected)

    return expected