Python函数名称中允许的字符 [英] Allowed characters in Python function names

问题描述

除了字母，数字和下划线之外，Python函数名称中是否还有其他允许的字符？如果是，他们是什么？

Are there any other allowed characters in Python function names except alphabetical characters, numbers, and underscores? If yes, what are they?

推荐答案

不在Python 2.x中。从文档：

Not in Python 2.x. From the docs:

identifier ::=  (letter|"_") (letter | digit | "_")*
letter     ::=  lowercase | uppercase
lowercase  ::=  "a"..."z"
uppercase  ::=  "A"..."Z"
digit      ::=  "0"..."9"

在Python 3中，它被展开了：

In Python 3 it's expanded:

identifier   ::=  xid_start xid_continue*
id_start     ::=  <all characters in general categories Lu, Ll, Lt, Lm, Lo, Nl, 
                   the underscore, and characters with the Other_ID_Start property>
id_continue  ::=  <all characters in id_start, plus characters in the categories 
                   Mn, Mc, Nd, Pc and others with the Other_ID_Continue property>
xid_start    ::=  <all characters in id_start whose NFKC normalization 
                   is in "id_start xid_continue*">
xid_continue ::=  <all characters in id_continue whose NFKC normalization 
                   is in "id_continue*">

The Unicode category codes mentioned above stand for:

Lu - uppercase letters
Ll - lowercase letters
Lt - titlecase letters
Lm - modifier letters
Lo - other letters
Nl - letter numbers
Mn - nonspacing marks
Mc - spacing combining marks
Nd - decimal numbers
Pc - connector punctuations
Other_ID_Start - explicit list of characters in PropList.txt 
                 to support backwards compatibility
Other_ID_Continue - likewise

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