__init__.py 文件源码

def __init__(self, parent=None):
        self._children = WeakKeyDictionary()
        self._parents = []

        self._local_registry = {}
        self._local_reserved_words = {}
        self._local_group_words = {}
        self._local_list_words = {}

        self._registry = {}
        self._reserved_words = {}
        self._group_words = {}
        self._list_words = {}

        if parent:
            self._parents.extend(parent._parents)
            self._parents.append(parent)
            parent._children[self] = True
            self._update_cache()