Python 转义序列 \N{name} 不按定义工作 [英] Python escape sequence \N{name} not working as per definition

问题描述

我正在尝试按照其名称打印 unicode 字符，如下所示:

# -*- 编码:utf-8 -*-打印\N{SOLIDUS}"打印 "\N{BLACK SPADE SUIT}"

然而我得到的输出并不是很令人鼓舞.

转义序列按原样打印.

ActivePython 2.7.2.5 (ActiveState Software Inc.) 基于Python 2.7.2(默认，2011 年 6 月 24 日，12:21:10)[MSC v.1500 32 位(英特尔)] on输入帮助"、版权"、信用"或许可"以获取更多信息.>>># -*- 编码:utf-8 -*-...打印\N{SOLIDUS}"\N{固体}>>>打印 "\N{BLACK SPADE SUIT}"\N{黑桃套装}>>>

但是我可以看到 另一位提问者 已经能够成功地做到这一点.

怎么了?

解决方案

那些序列只适用于unicode 字符串，这是 Python 3 中唯一的一种字符串.因此，在 Python 2 中，您需要在字符串文字前加上 u.

<预><代码>>>>打印 "\N{SOLIDUS} \N{BLACK SPADE SUIT}"\N{SOLIDUS} \N{黑桃套装}>>>打印 u"\N{SOLIDUS} \N{BLACK SPADE SUIT}"/♠

文档中的相关行:

<块引用>

\N{name} Unicode 数据库中名为 name 的字符(仅限 Unicode)

I am trying to print unicode characters given their name as follows:

# -*- coding: utf-8 -*-
print "\N{SOLIDUS}"
print "\N{BLACK SPADE SUIT}"

However the output I get is not very encouraging.

The escape sequence is printed as is.

ActivePython 2.7.2.5 (ActiveState Software Inc.) based on
Python 2.7.2 (default, Jun 24 2011, 12:21:10) [MSC v.1500 32 bit (Intel)] on
Type "help", "copyright", "credits" or "license" for more information.
>>> # -*- coding: utf-8 -*-
... print "\N{SOLIDUS}"
\N{SOLIDUS}
>>> print "\N{BLACK SPADE SUIT}"
\N{BLACK SPADE SUIT}
>>>

I can however see that another asker has been able to do this successfully.

What's wrong?

解决方案

Those sequences only work in unicode strings, which is the only kind of string Python 3 has. So in Python 2 you need to prefix the string literal with a u.

>>> print "\N{SOLIDUS} \N{BLACK SPADE SUIT}"
\N{SOLIDUS} \N{BLACK SPADE SUIT}
>>> print u"\N{SOLIDUS} \N{BLACK SPADE SUIT}"
/ ♠

Relevant line from the docs:

\N{name} Character named name in the Unicode database (Unicode only)

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