在python 2.x和3.x中提高异常 [英] Raise exception in python 2.x and 3.x

问题描述

如何将此代码移植到Python 3中，以便它可以同时运行在Python 2和Python3中？

How can I port this code to Python 3 so that it would run in both, Python 2 and Python3?

raise BarException, BarException(e), sys.exc_info()[2]

（从 http://blog.ionelmc.ro/2014 / 08/03 / the-most-under-low-feature-in-python-3 / ）

奖金问题 >
做一些像

Bonus question
Does it make sense to do something like

IS_PYTHON2 = sys.version_info < (3, 0)

if IS_PYTHON2:
    raise BarException, BarException(e), sys.exc_info()[2]
    # replace with the code that would run in Python 2 and Python 3 respectively
else:
    raise BarException("Bar is closed on Christmas")

推荐答案

您将不得不使用 exec（），因为您不能在Python中使用3参数语法3;它会引发语法错误。

You'll have to resort to using exec() because you cannot use the 3-argument syntax in Python 3; it'll raise a syntax error.

与 six library 已经覆盖，移植到不依赖于其他六个定义，他们的版本看起来像这样： / p>

As always the six library already has you covered, ported to not depend on other six definitions their version looks like this:

import sys

if sys.version_info[0] == 3:
    def reraise(tp, value, tb=None):
        if value is None:
            value = tp()
        if value.__traceback__ is not tb:
            raise value.with_traceback(tb)
        raise value

else:    
    exec("def reraise(tp, value, tb=None):\n    raise tp, value, tb\n")

现在您可以使用：

reraise(BarException, BarException(e), sys.exc_info()[2])

，无需进一步测试Python版本。

without further testing for a Python version.

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