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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 delete_file(self, commit, path):
 """ Deletes a file from a Commit. DeleteFile leaves a tombstone in the Commit, assuming the file isn't written to later attempting to get the file from the finished commit will result in not found error. The file will of course remain intact in the Commit's parent. Params: * commit: A tuple, string, or Commit object representing the commit. * path: The path to the file. """

        req = proto.DeleteFileRequest(file=proto.File(commit=commit_from(commit), path=path))
        self.stub.DeleteFile(req, metadata=self.metadata)