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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 validate_response(self):
 """Raises an exception if there was an error. Otherwise, do nothing. Clients should handle these errors, since these require custom handling to properly resolve. """

        if self.is_success():
            return

        # Handle the error if we have any information
        if self.details:
            error = self.details.get('error', None)

            if error == PushResponse.ERROR_DEVICE_NOT_REGISTERED:
                raise DeviceNotRegisteredError(self)
            elif error == PushResponse.ERROR_MESSAGE_TOO_BIG:
                raise MessageTooBigError(self)
            elif error == PushResponse.ERROR_MESSAGE_RATE_EXCEEDED:
                raise MessageRateExceededError(self)

        # No known error information, so let's raise a generic error.
        raise PushResponseError(self)