# -*- coding:utf-8 -*- 为什么要这样的格式？

还有一种是写在文件末尾

比如：
/* ----- for emacs ----- */
/* Local Variables: */
/* mode: php */
/* coding: utf-8-unix */
/* tab-width: 4 */
/* c-basic-offset: 4 */
/* indent-tabs-mode: nil */
/* End: */

paicha

2013-07-15 22:29:25 +08:00

@pubby 噢噢，那么用 # -*- coding:utf-8 -*- 可以理解为比 # coding:utf-8 兼容性更好么？

keakon

2013-07-15 22:30:02 +08:00

那是 emacs 设置 encoding 的风格。
http://www.python.org/dev/peps/pep-0263/

pubby

2013-07-15 22:36:17 +08:00

@paicha

额，不是这么说，如果你指的是emacs，那么可以看看这个

http://www.gnu.org/software/emacs/manual/html_node/emacs/Specifying-File-Variables.html#Specifying-File-Variables

sinxccc

2013-07-15 22:38:05 +08:00

这是给 Emacs 看的。

paicha

2013-07-15 22:47:01 +08:00

@pubby
@sinxccc

新手学编程勿怪。学习的教程是：Learn Python The Hard Way

查了下，Emacs 是一种编辑器。我现在是在 gedit 里编辑，然后终端运行 python ex1.py 。
然后发现中文会报错，后来就了解到声明 utf-8 编码就可以了。
发现在其他人写的一些代码也发现有这样的声明，于是就对这个声明有了点疑问。

notedit

2013-07-16 02:13:50 +08:00

这个是python的规范不是给emacs看的
python的解释器会读取这个设置

013231

2013-07-16 03:26:18 +08:00

Python支持3種不同方式的文件編碼聲明:
http://www.python.org/dev/peps/pep-0263/

Defining the Encoding
Python will default to ASCII as standard encoding if no other
encoding hints are given.

To define a source code encoding, a magic comment must
be placed into the source files either as first or second
line in the file, such as:

# coding=<encoding name>

or (using formats recognized by popular editors)

#!/usr/bin/python
# -*- coding: <encoding name> -*-

or

#!/usr/bin/python
# vim: set fileencoding=<encoding name> :

More precisely, the first or second line must match the regular
expression "coding[:=]\s*([-\w.]+)". The first group of this
expression is then interpreted as encoding name. If the encoding
is unknown to Python, an error is raised during compilation. There
must not be any Python statement on the line that contains the
encoding declaration.

To aid with platforms such as Windows, which add Unicode BOM marks
to the beginning of Unicode files, the UTF-8 signature
'\xef\xbb\xbf' will be interpreted as 'utf-8' encoding as well
(even if no magic encoding comment is given).

If a source file uses both the UTF-8 BOM mark signature and a
magic encoding comment, the only allowed encoding for the comment
is 'utf-8'. Any other encoding will cause an error.