human
Solve the following python programming problem given the following code:
def override_file_copy(self, expected_from_path, expected_to_dir) : 
    def file_copy(from_path, to_path) : 
        if (not from_path.endswith (names.PICKLED_MAIN_SESSION_FILE)) : 
            self.assertEqual (expected_from_path, from_path) 
            self.assertEqual (utils.path.join (expected_to_dir, names.DATAFLOW_SDK_TARBALL_FILE), to_path) 
if (from_path.startswith ('gs://') or to_path.startswith ('gs://')) : 
            logging.info ('Faking file_copy(%s, %s)', from_path, to_path) 
else : 
            shutil.copyfile (from_path, to_path) 
dependency._dependency_file_copy = self 

    
    

    Fix the buggy line: dependency._dependency_file_copy = self
assistant
#Here is Python program to fix the buggy line: dependency.

dependency._dependency_file_copy = def file_copy(