action_base.py 文件源码

def __new__(cls, name, bases, attrs):
        super_new = super(AccountActionMetaclass, cls).__new__
        parents = [base for base in bases if isinstance(base, AccountActionMetaclass)]
        if not parents:
            # We stop here if we are considering AccountActionBase and not
            # one of its subclasses
            return super_new(cls, name, bases, attrs)
        new_action = super_new(cls, name, bases, attrs)

        # Performs some checks

        action_name = getattr(new_action, 'name', None)
        if action_name is None or not isinstance(action_name, six.string_types):
            raise ImproperlyConfigured('The "name" attribute must be a string')

        execute_method = getattr(new_action, 'execute', None)
        if execute_method is None or \
                not (inspect.ismethod(execute_method) or inspect.isfunction(execute_method)):
            raise ImproperlyConfigured('The "execute" method must be configured')

        return new_action