sys:1: DeprecationWarning: Non-ASCII character '\xe6' in file 0730.py on line 2
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在文件的首行加上
#!/usr/bin/python
# -*- coding: <encoding name> -*-
这样就好了。
我用的是utf8
#!/usr/bin/python # -*- coding: utf-8 -*-
先来看看python的版本:
>>> sys.version
'2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)]'
(一)用记事本创建一个文件ChineseTest.py,默认ANSI:
print s
测试一下瞧瞧:
File "ChineseTest.py", line 1
SyntaxError: Non-ASCII character '\xd6' in file ChineseTest.py on line 1, but noencodingdeclared; see http://www.pytho
n.org/peps/pep-0263.html for details
偷偷地把文件编码改成UTF-8:
File "ChineseTest.py", line 1
SyntaxError: Non-ASCII character '\xe4' in file ChineseTest.py on line 1, but noencodingdeclared; see http://www.pytho
n.org/peps/pep-0263.html for details
无济于事。。。
既然它提供了网址,那就看看吧。简单地浏览一下,终于知道如果文件里有非ASCII字符,需要在第一行或第二行指定编码声明。把ChineseTest.py文件的编码重新改为ANSI,并加上编码声明:
s = "中文"
print s
再试一下:
中文
正常咯:)
(二)看一看它的长度:
s = "中文"
print len(s)
结果:4。
s这里是str类型,所以计算的时候一个中文相当于两个英文字符,因此长度为4。
我们这样写:
s = "中文"
s1 = u"中文"
s2 = unicode(s, "gbk")#省略参数将用python默认的ASCII来解码
s3 = s.decode("gbk")#把str转换成unicode是decode,unicode函数作用与之相同
print len(s1)
print len(s2)
print len(s3)
结果:
2
2
2
(三)接着来看看文件的处理:建立一个文件test.txt,文件格式用ANSI,内容为:abc中文,用python来读取
print open("Test.txt").read()
结果:abc中文
把文件格式改成UTF-8:
结果:abc涓 枃
显然,这里需要解码:
import codecs
print open("Test.txt").read().decode("utf-8")
结果:abc中文
上面的test.txt我是用Editplus来编辑的,但当我用Windows自带的记事本编辑并存成UTF-8格式时,
运行时报错:
import codecs
print open("Test.txt").read().decode("utf-8")
原来,某些软件,如notepad,在保存一个以UTF-8编码的文件时,会在文件开始的地方插入三个不可见的字符(0xEF 0xBB 0xBF,即BOM)。
因此我们在读取时需要自己去掉这些字符,python中的codecs module定义了这个常量:
import codecs
print open("Test.txt").read().decode("utf-8")
结果:abc中文
(四)一点遗留问题
在第二部分中,我们用unicode函数和decode方法把str转换成unicode。为什么这两个函数的参数用"gbk"呢?
第一反应是我们的编码声明里用了gbk(# coding=gbk),但真是这样?
修改一下源文件:
s = "中文"
print unicode(s, "utf-8")
运行,报错:
File "ChineseTest.py", line 3, in <module>
s = unicode(s, "utf-8")
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 0-1: invalid data
显然,如果前面正常是因为两边都使用了gbk,那么这里我保持了两边utf-8一致,也应该正常,不至于报错。
更进一步的例子,如果我们这里转换仍然用gbk:
s = "中文"
print unicode(s, "gbk")
结果:中文
翻阅了一篇英文资料,它大致讲解了python中的print原理:
When Python executes a print statement, it simply passes the output to the operating system (using fwrite() or something like it), and some other program is responsible for actually displaying that output on the screen. For example, on Windows, it might be the Windows console subsystem that displays the result. Or if you're using Windows and running Python on a Unix box somewhere else, your Windows SSH client is actually responsible for displaying the data. If you are running Python in an xterm on Unix, then xterm and your X server handle the display.
To print data reliably, you must know the encoding that this display program expects.
简单地说,python中的print直接把字符串传递给操作系统,所以你需要把str解码成与操作系统一致的格式。Windows使用CP936(几乎与gbk相同),所以这里可以使用gbk。
最后测试:
s = "中文"
print unicode(s, "cp936")
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