在Python中首选哪个`if x：`或`if x！= 0：`？ [英] Which of `if x:` or `if x != 0:` is preferred in Python?

问题描述

假设 x 是整数，构造如果x：在功能上与 if x！= 0：在Python中。一些语言的样式指南明确禁止前者 - 例如，ActionScript / Flex的样式指南声明，你不应该为这种事情隐式地转换一个int到bool。

Assuming that x is an integer, the construct if x: is functionally the same as if x != 0: in Python. Some languages' style guides explicitly forbid against the former -- for example, ActionScript/Flex's style guide states that you should never implicitly cast an int to bool for this sort of thing.

Python有偏好吗？

Does Python have a preference? A link to a PEP or other authoritative source would be best.

推荐答案

结构： if x： 通常用于检查布尔值。

The construct: if x: is generally used to check against boolean values.

对于 int 显式 x！= 0 是首选的 - 沿着显式比隐式（ PEP 20 - Python禅宗）。

For ints the use of the explicit x != 0 is preferred - along the lines of explicit is better than implicit (PEP 20 - Zen of Python).

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