human
Solve the following python programming problem given the following code:
@ contextmanager 
def mock_history(initial) : 
    ' mock the commands that interact with the .history file, to fake
        history management
    ' 
    releases = copy.copy (initial) 
    project = 'project' 
    def list_releases() : 
        return releases 
def _append_to_history(release) : 
        releases.append (release) 
def _replace_history(release_list) : 
        releases [:] = release_list 
with nested (patch ('gonzo.tasks.release.list_releases', list_releases), patch ('gonzo.tasks.release._append_to_history', _append_to_history), patch ('gonzo.tasks.release._replace_history', <MASK>), patch ('gonzo.tasks.release.get_project')) as (_, _, _, get_project) : 
        get_project.return_value = project 
        with disable_external_commands () : 
            (yield releases) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: get_project, project, list_releases, initial, _, releases, _append_to_history
assistant
#Here is a proper replacement for <MASK>.
def _replace_history(