[issue47028] Incorrect behaviour when zipping a bunch of maps

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

This is because i is not captured by the function definition. `lambda x: x**i` always makes the "input to the ith power" function, never the "input to the 3rd power" function, even if i happens to be 3 right now.

Consider replacing `lambda x: x**i` with `lambda x, i=i: x**i` to explicitly capture the current value of i as a default.

Changing the scoping rules now would be a big backwards-incompatible change.

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nosy: +Dennis Sweeney

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47028>
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