human
Solve the following python programming problem given the following code:
def override_file_download(self, expected_from_url, expected_to_folder) : 
    def file_download(from_url, _) : 
        self.assertEqual (expected_from_url, from_url) 
        tarball_path = os.path.join (expected_to_folder, 'sdk-tarball') 
        with open (tarball_path, 'w') as f : 
            f.write ('Some contents.') 
return tarball_path 
dependency._dependency_file_download = expected_from_url 
    return os.path.join (expected_to_folder, 'sdk-tarball') 

    
    

    Fix the buggy line: dependency._dependency_file_download = expected_from_url
assistant
#Here is Python code to fix the buggy line: dependency.

dependency._dependency_file_download = def file_download(