过多的代码注释会减慢执行速度吗？ [英] Will excessive commenting of code slow execution?

问题描述

可能重复：

Possible Duplicate:
Do comments slow down an interpreted language?

如果正确注释了超过75％的代码行，在执行大型.py文件时，性能会明显下降吗？

Will there be noticeable performance degradation in the execution of a large .py file if more than 75% of the lines of code are properly commented?

推荐答案

否

运行python时，第一步是转换为字节码，这就是那些 .pyc 文件。注释已从其中删除，因此 ^* 无关紧要。

When you run python, the first step is to convert to bytecode, which is what those .pyc files are. Comments are removed from these, so it won't matter^*.

如果使用 -O 或 -OO 选项，python将生成优化的 pyo 文件，这些文件可以忽略不计，甚至更快。主要区别在于：

If you run with the -O or -OO option, python will produce "optimized" pyo files, which are negligibly faster, if faster at all. The main difference is that:

• ，


• 使用 -OO 选项，将除去 __ doc __ 字符串。考虑到有时需要这些，建议不要使用 -OO 运行。

• with -O assertion are removed,
• with the -OO option, the __doc__ strings are stripped out. Given that those are sometimes needed, running with -OO isn't recommended.

^* 以下指出c $ c> .pyc 文件仅为模块保存。因此，每次执行时都必须重新编译顶级可执行文件。此步骤可以降低 massive python可执行文件的速度。在实践中，大多数代码应驻留在模块中，因此这不是问题。

^* it's been pointed out below that .pyc files are only saved for modules. Thus the top-level executable must be recompiled every time it's run. This step could slow down a massive python executable. In practice, most of the code should reside in modules, making this a non-issue.

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