Python和UTF-8：有点令人困惑 [英] Python and UTF-8: kind of confusing

问题描述

我在Python 2.5的谷歌应用程序引擎上。我的应用程序必须处理多语言，所以我必须处理utf-8。

我做了很多google，但没有得到我想要的。

1.

的用法是什么？< - c $ c>＃ - * - coding：utf-8 - * -

2.

  s = u'Witajświecie'
s = 'Witajświecie'
  

'witajświecie'是一个utf-8字符串。

3.当我将.py文件保存为'utf-8'时，在每个字符串之前是否还需要 u p>

解决方案

u'blah'将其变成另一种 / em>字符串（类型 unicode 而不是类型 str ） - 它使它成为一个unicode代码点序列。没有它，它是一系列字节。只有字节可写入磁盘或网络流，但您通常希望使用Unicode（尽管Python和某些库会为您执行一些转换） - 编码（utf-8）是这些。所以，是的，你应该在所有文字前面使用 u ，它会让你的生活变得更轻松。请参阅 Programatic Unicode 以获得更好的解释。

<编码行告诉Python你的文件是什么编码，以便Python可以理解它。再次，从磁盘读取字节 - 但Python希望看到字符。在Py2中，代码的默认编码是ASCII，因此编码行可以让您直接在.py文件中放置ś这样的东西 - 除此之外，它不会改变你的代码的工作方式。

I am on google app engine with Python 2.5. My application have to deal with multilanguages so I have to deal with utf-8.

I have done lots of google but dont get what I want.

1.Whats the usage of # -*- coding: utf-8 -*- ?

2.What is the difference between

s=u'Witaj świecie'
s='Witaj świecie'

'Witaj świecie' is a utf-8 string.

3.When I save the .py file to 'utf-8', do I still need the u before every string?

解决方案

u'blah' turns it into a different kind of string (type unicode rather than type str) - it makes it a sequence of unicode codepoints. Without it, it is a sequence of bytes. Only bytes can be written to disk or to a network stream, but you generally want to work in Unicode (although Python, and some libraries, will do some of the conversion for you) - the encoding (utf-8) is the translation between these. So, yes, you should use the u in front of all your literals, it will make your life much easier. See Programatic Unicode for a better explanation.

The coding line tells Python what encoding your file is in, so that Python can understand it. Again, reading from disk gives bytes - but Python wants to see the characters. In Py2, the default encoding for code is ASCII, so the coding line lets you put things like ś directly in your .py file in the first place - other than that, it doesn't change how your code works.

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