What's the meaning of
def tree():
return defaultdict(tree)
t = tree()
How can I do it without function?
t = defaultdict()
It's not the same.
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2Yes, it's not the same. What do you want to achieve, exactly? – mkrieger1 Sep 14 '21 at 08:18
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`tree` is a function which, when called, returns a defaultdict which calls `tree` for non-existent values, i.e. creates a defaultdict which uses `tree` for each non-existent value. Since this definition is recursive, it's not really possible to make it a one-liner. – deceze Sep 14 '21 at 08:22
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the same behavior @mkrieger1 – Alex Sep 14 '21 at 09:00