handlerutils.py 文件源码

def itersubclasses(cls, _seen=None):  

    if not isinstance(cls, type):
        raise TypeError('itersubclasses must be called with '
                        'new-style classes, not %.100r' % cls)
    if _seen is None: _seen = set()
    try:
        subs = cls.__subclasses__()
    except TypeError: # fails only when cls is type
        subs = cls.__subclasses__(cls)
    for sub in subs:
        isAbstract = inspect.isabstract(sub)
        #print str(sub) + "is abstract: " + str(isAbstract)
        if sub not in _seen:
            _seen.add(sub)
            if not isAbstract:
                print "Loading Handler: " + str(sub)
                yield sub
            for sub in itersubclasses(sub, _seen):
                yield sub   

#assistanHandlerClasses = vars()['AssistantHandler'].__subclasses__()