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python2.x：Error When Printing an Exception Containing a Unicode String

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Python2.x中抛出Unicode的异常需要注意:

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>>> try:
...     raise Exception(u'Error when printing 中文异常')
... except Exception, e:
...     print e
...     print str(e)

会报UnicodeEncodeError: ‘ascii’ codec can’t encode character …

同样，如果在log中直接输出，也会报错

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>>> import logging
    logger = logging.getLogger('default')
    try:
...     raise Exception(u'Error when printing 中文异常')
... except Exception, e:
...     logger.error(e)
...     logger.error("%s", e)
...     logger.error("%s", str(e))

简单的解决办法就是用e.message

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>>> try:
...     raise Exception(u'Error when printing 中文异常')
... except Exception, e:
...     print e.message
...     print "%s" % e.message

也可以详细的可以指定encoder

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>>> try:
...     raise Exception(u'Error when printing 中文异常')
... except Exception, e:
...     print unicode(e.message).encode('utf-8')

Python3就没这个事了，备忘一下。

参考:

http://bugs.python.org/issue2517

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