python unicode 处理 print 和 sys.stdout.write 之间的差异

发布于 2024-12-13 22:14:09 字数 811 浏览 0 评论 0原文

首先我要说的是，我已经看过这篇文章：奇怪的 python 打印行为unicode，但那里提供的解决方案（使用 PYTHONIOENCODING）对我不起作用。

这是我的问题：

Python 2.6.5 (r265:79063, Apr  9 2010, 11:16:46)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
>>> a = u'\xa6'
>>> print a 
Â¦

工作正常，但是：

>>> sys.stdout.write(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa6' in position 0: ordinal not in range(128)

抛出错误。我在顶部链接到的帖子表明这是因为默认控制台编码是“ascii”。然而，就我而言，情况并非如此：

>>> sys.stdout.encoding
'UTF-8'

那么对于这里的工作以及如何解决这个问题有什么想法吗？

谢谢 D .

原文

I'll start by saying that I've already seen this post: Strange python print behavior with unicode, but the solution offered there (using PYTHONIOENCODING) didn't work for me.

Here's my issue:

Python 2.6.5 (r265:79063, Apr  9 2010, 11:16:46)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
>>> a = u'\xa6'
>>> print a 
Â¦

works just fine, however:

>>> sys.stdout.write(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa6' in position 0: ordinal not in range(128)

throws an error. The post I linked to at the top suggests that this is because the default console encoding is 'ascii'. However, in my case it's not:

>>> sys.stdout.encoding
'UTF-8'

So any thoughts on what's at work here and how to fix this issue?

Thanks
D.

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白昼 2024-12-20 22:14:09

这是由于一个长期存在的错误，该错误已在 python-2.7 中修复，但为时已晚向后移植到 python-2.6。

该文档指出，当将 unicode 字符串写入文件时，应使用文件.编码。但 sys.stdout 并没有遵守这一点，而是使用默认的 unicode 编码。这通常由 site 模块设置为“ascii”，但它可以使用 sys.setdefaultencoding 进行更改：

Python 2.6.7 (r267:88850, Aug 14 2011, 12:32:40) [GCC 4.6.2] on linux3
>>> a = u'\xa6\n'
>>> sys.stdout.write(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec cant encode character u'\xa6' ...
>>> reload(sys).setdefaultencoding('utf8')
>>> sys.stdout.write(a)
¦

但是，更好的解决方案可能是替换 sys.stdout 带有包装器：

class StdOut(object):
    def write(self, string):
        if isinstance(string, unicode):
            string = string.encode(sys.__stdout__.encoding)
        sys.__stdout__.write(string)

>>> sys.stdout = StdOut()
>>> sys.stdout.write(a)
¦

This is due to a long-standing bug that was fixed in python-2.7, but too late to be back-ported to python-2.6.

The documentation states that when unicode strings are written to a file, they should be converted to byte strings using file.encoding. But this was not being honoured by sys.stdout, which instead was using the default unicode encoding. This is usually set to "ascii" by the site module, but it can be changed with sys.setdefaultencoding:

Python 2.6.7 (r267:88850, Aug 14 2011, 12:32:40) [GCC 4.6.2] on linux3
>>> a = u'\xa6\n'
>>> sys.stdout.write(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec cant encode character u'\xa6' ...
>>> reload(sys).setdefaultencoding('utf8')
>>> sys.stdout.write(a)
¦

However, a better solution might be to replace sys.stdout with a wrapper:

class StdOut(object):
    def write(self, string):
        if isinstance(string, unicode):
            string = string.encode(sys.__stdout__.encoding)
        sys.__stdout__.write(string)

>>> sys.stdout = StdOut()
>>> sys.stdout.write(a)
¦

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