将python对象图递归转换为字典

从Anurag Uniyal和Lennart Regebro的答案中总结出我自己的尝试和线索对我来说最有效：

def todict(obj, classkey=None):    if isinstance(obj, dict):        data = {}        for (k, v) in obj.items(): data[k] = todict(v, classkey)        return data    elif hasattr(obj, "_ast"):        return todict(obj._ast())    elif hasattr(obj, "__iter__") and not isinstance(obj, str):        return [todict(v, classkey) for v in obj]    elif hasattr(obj, "__dict__"):        data = dict([(key, todict(value, classkey))  for key, value in obj.__dict__.items()  if not callable(value) and not key.startswith('_')])        if classkey is not None and hasattr(obj, "__class__"): data[classkey] = obj.__class__.__name__        return data    else:        return obj