Python try...except 逗号 vs 'as' in except [英] Python try...except comma vs 'as' in except

问题描述

except 语句中的,"和as"有什么区别，例如:

What is the difference between ',' and 'as' in except statements, eg:

try:
    pass
except Exception, exception:
    pass

和:

try:
    pass
except Exception as exception:
    pass

2.6 中的第二种语法是否合法?它适用于 Windows 上的 CPython 2.6，但 cygwin 中的 2.5 解释器抱怨它无效.

Is the second syntax legal in 2.6? It works in CPython 2.6 on Windows but the 2.5 interpreter in cygwin complains that it is invalid.

如果它们在 2.6 中都有效，我应该使用哪个?

If they are both valid in 2.6 which should I use?

推荐答案

最终文档是 PEP-3110:捕获异常

总结:

• 在 Python 3.x 中，必须使用 as 为变量分配异常.
• 在 Python 2.6+ 中，使用 as 语法，因为它没有歧义，并且与 Python 3.x 向前兼容.
• 在 Python 2.5 及更早版本中，请使用逗号版本，因为不支持 as.

• In Python 3.x, using as is required to assign an exception to a variable.
• In Python 2.6+, use the as syntax, since it is far less ambiguous and forward compatible with Python 3.x.
• In Python 2.5 and earlier, use the comma version, since as isn't supported.

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