Leetcode 101 Symmetric Tree Python

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In this video we solve Leetcode number 101 Symmetric Tree in Python
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I cant rly find any information how the "val == val" in return works.
does it return False if one of the nodes returns false? so either all are true then it returns true at the end or false if only 1 returns false?

kippe
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But the explanation was not that bad. Good job.

joshuaowusuansah