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def breadth_first(tree,children=iter):
    """Traverse the nodes of a tree in breadth-first order.
    The first argument should be the tree root; children
    should be a function taking as argument a tree node and
    returning an iterator of the node's children.
    yield tree
    last = tree
    for node in breadth_first(tree,children):
        for child in children(node):
            yield child
            last = child
        if last == node:


  • revision 2 (20 years ago)
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