与IOError关联的Python错误号是否稳定？ [英] Are Python error numbers associated with IOError stable?

问题描述

我想移动一个文件，但是在没有找到的情况下，我应该忽略它。在所有其他情况下，应该传播异常。我有以下Python代码：

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

errno == 2是一个，没有这样的文件或目录的描述。我想知道这是否在Python版本和平台之间是稳定的，等等。

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

最好使用 errno 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

如果整数误差值发生变化（尽管不太可能发生），则代码不太可能中断。

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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