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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 patch(self, endpoint, data):
 """ Method to update an item The headers must include an If-Match containing the object _etag. headers = {'If-Match': contact_etag} The data dictionary contain the fields that must be modified. If the patching fails because the _etag object do not match with the provided one, a BackendException is raised with code = 412. If inception is True, this method makes e new get request on the endpoint to refresh the _etag and then a new patch is called. If an HTTP 412 error occurs, a BackendException is raised. This exception is: - code: 412 - message: response content - response: backend response All other HTTP error raises a BackendException. If some _issues are provided by the backend, this exception is: - code: HTTP error code - message: response content If no _issues are provided and an _error is signaled by the backend, this exception is: - code: backend error code - message: backend error message - response: JSON encoded backend response :param endpoint: endpoint (API URL) :type endpoint: str :param data: properties of item to update :type data: dict :param headers: headers (example: Content-Type). 'If-Match' required :type headers: dict :param inception: if True tries to get the last _etag :type inception: bool :return: dictionary containing patch response from the backend :rtype: dict """

        response = self.get_response(method='PATCH', endpoint=endpoint, json=data,
                                     headers={'Content-Type': 'application/json'})

        if response.status_code == 200:
            return self.decode(response=response)

        return response