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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 _new_mock_response(self, response, file_path):
        '''Return a new mock Response with the content.'''
        mock_response = copy.copy(response)

        mock_response.body = Body(open(file_path, 'rb'))
        mock_response.fields = NameValueRecord()

        for name, value in response.fields.get_all():
            mock_response.fields.add(name, value)

        mock_response.fields['Content-Type'] = 'text/html; charset="utf-8"'

        return mock_response