composition.py 文件源码

def __init__(
        self,
        name=None,
        children=None,
        source_range=None,
        metadata=None
    ):
        item.Item.__init__(
            self,
            name=name,
            source_range=source_range,
            metadata=metadata
        )
        collections.MutableSequence.__init__(self)

        self._children = []
        if children:
            # cannot simply set ._children to children since __setitem__ runs
            # extra logic (assigning ._parent pointers).
            self.extend(children)