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A comment on WTFPython – Understanding Python through surprising snippets. Parent comment

Re:WTFPython – Understanding Python through surprising snippets by sjagoe on Monday December 23, 2019 @08:36AM (#21863483)
That's a different issue around default arguments that are mutable, rather than default arguments generally.

The lambda case here is more like a default argument of a constant integer (immutable) than a default that is a list, which can be altered directly by the function it's a default of.

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Re:WTFPython – Understanding Python through surprising snippets by Izkata on Monday December 23, 2019 @08:47AM (#21863532)
The underlying feature that both rely on is that default arguments are set on function declaration instead of function call. Mutable/immutable only affects whether or not you hit the bug.
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