Mutating state within a getter is a fundamental violation of the principle of least astonishment that no amount of "Python magic" can justify. This video serves as a necessary warning against turning simple data access into a minefield of unintended side effects.
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This Output Makes No Sense: Why adding __getitem__ breaks your object's state unexpectAdded:
My adding get item breaks your object state unexpectedly. Let's look at the bug. Here is the buggy code. Look carefully. The bug is that get item overrides the cache on every access, losing previous state. Python calls get item on every access. So, if you mutate state unconditionally there, you corrupt internal data structures. Here is the correct fix. Master dunder methods before your next fan ground.
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