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python中sys.setdefaultencoding()抛错?

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悬赏园豆:30 [已关闭问题] 关闭于 2013-11-11 23:18

为啥我直接在shell下输入下面命令报错?

 1 i4oolish@i4 /cygdrive/u/trunk/python
 2 $ python
 3 Python 2.7.3 (default, Dec 18 2012, 13:50:09)
 4 [GCC 4.5.3] on cygwin
 5 Type "help", "copyright", "credits" or "license" for more information.
 6 >>> import sys
 7 >>> sys.setdefaultencoding('iso-8859-1')
 8 Traceback (most recent call last):
 9   File "<stdin>", line 1, in <module>
10 AttributeError: 'module' object has no attribute 'setdefaultencoding'
11 >>>

上面第7行报错。而下面这样就可以

在python2.7的目录

i4oolish@i4 /usr/lib/python2.7/site-packages

中新建文件:sitecustomize.py,内容为:

1 import sys
2 sys.setdefaultencoding('iso-8859-1')

然后在shell下执行下面命令就是对的:

 1 i4oolish@i4 /usr/lib/python2.7/site-packages
 2 $ vi sitecustomize.py
 3 
 4 i4oolish@i4 /usr/lib/python2.7/site-packages
 5 $ cat sitecustomize.py
 6 
 7 import sys
 8 sys.setdefaultencoding('iso-8859-1')
 9 
10 i4oolish@i4 /usr/lib/python2.7/site-packages
11 $ python
12 Python 2.7.3 (default, Dec 18 2012, 13:50:09)
13 [GCC 4.5.3] on cygwin
14 Type "help", "copyright", "credits" or "license" for more information.
15 >>> import sys
16 >>> sys.getdefaultencoding()
17 'iso-8859-1'
18 >>>

这是为啥?

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所有回答(1)
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为了防止重新设置默认编码影响原本依赖ASCII编码的程序,Python编译器在启动时特意清除了sys模块的setdefaultencoding方法。如果需要调用,也可以reload(sys),然后就可以看到sys.setdefaultencoding方法了,不过设置之后就是后果自负了:-D

harelion | 园豆:202 (菜鸟二级) | 2017-02-19 11:25
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