__init__.py 文件源码

def call_command(name, *args, **options):
    """
    Calls the given command, with the given options and args/kwargs.

    This is the primary API you should use for calling specific commands.

    Some examples:
        call_command('syncdb')
        call_command('shell', plain=True)
        call_command('sqlall', 'myapp')
    """
    # Load the command object.
    try:
        app_name = get_commands()[name]
    except KeyError:
        raise CommandError("Unknown command: %r" % name)

    if isinstance(app_name, BaseCommand):
        # If the command is already loaded, use it directly.
        klass = app_name
    else:
        klass = load_command_class(app_name, name)

    # Grab out a list of defaults from the options. optparse does this for us
    # when the script runs from the command line, but since call_command can
    # be called programatically, we need to simulate the loading and handling
    # of defaults (see #10080 for details).
    defaults = {}
    for opt in klass.option_list:
        if opt.default is NO_DEFAULT:
            defaults[opt.dest] = None
        else:
            defaults[opt.dest] = opt.default
    defaults.update(options)

    return klass.execute(*args, **defaults)