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bpo-32856: Optimize the assignment idiom in comprehensions. by serhiy-storchaka · Pull Request #16814 · python/cpython

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@serhiy-storchaka

Now for y in [expr] in comprehensions is so fast as a simple assignment y = expr.

Unlike to the := operator this idiom does not leak a variable to the outer scope.

https://bugs.python.org/issue32856

Now `for y in [expr]` in comprehensions is so fast as a simple
assignment `y = expr`.

@serhiy-storchaka serhiy-storchaka changed the title Optimize assignment idiom in comprehensions bpo-32856: Optimize the assignment idiom in comprehensions.

Oct 15, 2019

scoder

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I don't have an opinion on the general feature, so just a few comments.

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* Optimized the idiom for assignment a temporary variable in comprehensions.
Now ``for y in [expr]`` in comprehensions is so fast as a simple assignment

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"as fast as" (also in news file)

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Done. Thank you.

@scoder

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