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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 get_file(self, file, **kwargs):
 """ Return the standard attachment json object for a file. :calls: `GET /api/v1/files/:id \ <https://canvas.instructure.com/doc/api/files.html#method.files.api_show>`_ :param file: The object or ID of the file to retrieve. :type file: :class:`canvasapi.file.File` or int :rtype: :class:`canvasapi.file.File` """

        file_id = obj_or_id(file, "file", (File,))

        response = self.__requester.request(
            'GET',
            'files/{}'.format(file_id),
            _kwargs=combine_kwargs(**kwargs)
        )
        return File(self.__requester, response.json())