nodes.py 文件源码

def first_child_not_matching_class(self, childclass, start=0,
                                       end=sys.maxint):
        """
        Return the index of the first child whose class does *not* match.

        Parameters:

        - `childclass`: A `Node` subclass to skip, or a tuple of `Node`
          classes. If a tuple, none of the classes may match.
        - `start`: Initial index to check.
        - `end`: Initial index to *not* check.
        """
        if not isinstance(childclass, tuple):
            childclass = (childclass,)
        for index in range(start, min(len(self), end)):
            for c in childclass:
                if isinstance(self.children[index], c):
                    break
            else:
                return index
        return None