与IO错误稳定相关的Python错误号码？ [英] Are Python error numbers associated with IOError stable?

问题描述

我要移动的文件，但在情况下，它没有找到我应该忽略它。在其他情况下的异常应被传播。我有下面这段Python的code的：

I want to move a file, but in the case it is not found I should just ignore it. In all other cases the exception should be propagated. I have the following piece of Python code:

try:
    shutil.move(old_path, new_path)
except IOError as e:
    if e.errno != 2: raise e

错误号== 2是一个，有没有这样的文件或目录的说明。我不知道这是不同的Python版本和平台，等。

errno == 2 is the one, that has 'No such file or directory' description. I wonder if this is stable across Python versions and platforms, and etc.

推荐答案

这是更好地从的错误号模块，而不是硬编码值 2 ：

It is better to use values from the errno module instead of hardcoding the value 2:

try:
    shutil.move(old_path, new_path)
except IOError as e:
    if e.errno != errno.ENOENT: raise e

这使你的code不太可能的情况下，打破了整误差值的变化（尽管这不太可能发生）。

This makes your code less likely to break in case the integer error value changes (although that is unlikely to occur).

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