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should the return value for `__enter__` method always be `self` in python

Shouldn't the return value for the __enter__ method be self always. Python documentation says : object.__enter__(self) Enter ... = a() s.main() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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should i use empty() php function

which is better? if (!empty($val)) { // do something } and if ($val) { // do something } when i test ... or have any idea which way is better? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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