[Python 语法] 询问在 String 中关于 % 的用法（找不到相关文档）

[terence4444]

请问以下的用法相关文档可以在哪里找到？我想知道是否关于 % 还有其它用法。

string1 = 'string replace %s'
string2 = 'abcdefg'
string3 = string1 % string2
>> string3 == 'string replace abcdefg'

谢谢

[fy]

@necomancer
@qihboy

虽然 PEP3101 并没有推荐不推荐的内容， str.format 的 3.5 版本文档里也没有这句话，但我在别处发现了一段信息：
https://docs.python.org/3.5/library/stdtypes.html#printf-style-string-formatting

Note: The formatting operations described here exhibit a variety of quirks that lead to a number of common errors (such as failing to display tuples and dictionaries correctly). Using the newer str.format() interface helps avoid these errors, and also provides a generally more powerful, flexible and extensible approach to formatting text.

他说元组和字典的显示有问题，然而貌似并没有：

>>> '%s and %s a' % ((1,2,3), {1:2, 'a':2})
"(1, 2, 3) and {1: 2, 'a': 2} a"

不知道为什么官方文档会有如此明显的倾向性，还没给出合适的例子。我个人觉得 .format 作为一个复杂蛋疼的机制，还是太冗长，不讨喜。

[youngsterxyf]

http://blog.xiayf.cn/2013/01/26/python-string-format/

[hitmanx]

说找不到也是蛮奇怪的事,我 google "python string percentage sign",前 5 条都是关于这个的,其中第 5 条就是官方ｄｏｃ.

[terence4444]

@hitmanx 我用 "Python String Operator %" 找的…… 以为是一个 operator ，昨天在家用的 Bing

[hitmanx]

@terence4444 不是我较真啊.按照你的关键词搜,无论是 bing 还是 google 前几个结果都是关于这个的啊,莫非是我这里搜索多了排名有优化?

bing 的结果如下..除了第二个可能不对以外,其他的每个都包含了 "% operator", "string formatting"之类的关键字.

7.1. string — Common string operations — Python …
https://docs.python.org/2/library/string
The string module contains a number ... Python ’ s built-in string classes support ... To output formatted strings use template strings or the % operator described in ...

python convert a string to an operator - Stack Overflow
stackoverflow.com/.../5117112/python-convert-a-string-to-an-operator
RESOLVEDLAST UPDATED: 2/25/20113 POSTSFIRST POST: 2/25/2011
Is it possible to convert a string to an operator in python? I would like to pass a condition to a function Ideally it would look like this: def foo(self, attribute ...

performance - Python string formatting: % vs. .format ...
stackoverflow.com/questions/5082452
RESOLVEDLAST UPDATED: 12/23/20138 POSTSFIRST POST: 2/22/2011
Python 2.6 introduced the str.format() method with a slightly different syntax from the existing % operator. Which is better and for what situations? The following ...

5. Built-in Types — Python 2.7.11 documentation
https://docs.python.org/2/library/stdtypes
To output formatted strings use template strings or the % operator described in the String Formatting Operations section. ... String (converts any Python object using str
Python Strings - Tutorialspoint

www.tutorialspoint.com/python/python_strings.htm
String Formatting Operator. One of Python's coolest features is the string format operator %. This operator is unique to strings and makes up for the pack of having ...

[se77en]

最全的解释 https://pyformat.info

[terence4444]

@hitmanx 我找的结果好像和你贴的不一样，不过即使一样也没有很多相关信息把引导到 format 上去

7.1. string — Common string operations — …翻译此页
The string module contains a number ... Python ’ s built-in string classes support ... To output formatted strings use template strings or the % operator described in ...

python convert a string to an operator - Stack Overflow
最佳答案 Is it possible to convert a string to an operator in python? I would like to pass a condition to a function Ideally it would look like this: def foo(self, attribute ...详情
stackoverflow.com/.../5117112/python-convert-a-string-to-an-operator  ·  2011-02-25

9.9. operator — Standard operators as functions …翻译此页
This table shows how abstract operations correspond to operator symbols in the Python syntax and the functions in the ... String Formatting: s % obj: mod(s, obj ...

5. Built-in Types — Python 2.7.11 documentation 翻译此页
To output formatted strings use template strings or the % operator described in the String Formatting Operations section. ... String (converts any Python object using str

BitwiseOperators - Python Wiki 翻译此页
These are Python's bitwise operators. ... they treat it as if it were a string of bits, ... Python allows operator overloading, ...
https://wiki.python.org/moin/BitwiseOperators
Operators and String Formatting in Python - …翻译此页
Operators and String Formatting . Terms in This Chapter . Format directives; Hexdump; Key; Keyword; Literal; Modulus; Operator precedence; Boolean value; Class ...
www.informit.com/articles/article.aspx?p=28790

在第一个搜索结果中并没有 format 这样的用法，我都是打开然后直接搜索 % 符号找的，知道 % 和 format 是一样的话应该可以找到，但是不知道的话，我觉得并不是那么容易。

[necomancer]

@fy

a = (1, 2)
print("position is %s" % name) 会报错，需要
(name, )的写法吧。

[necomancer]

@fy

BTW 我个人也倾向 %, 感觉更直白简单一点

[necomancer]

我了个脑残，变量名都弄错了， V2EX 好像也不能改

[MinskyNg]

新版的 python 教程好像都推荐 format,功能更强大

[kkzxak47]

format 更简单，开始用就会喜欢上它

[Arthur2e5]

@terence4444 第一种 %(foo)s 指定了字段的名称，经常能让东西更可读（特别是翻译软件的时候译者可以直接看到这里是什么东西）——相应地你应该在 format 里面用 "{foo}".format(foo='bar')。

@ethego 考虑类型…… Python 还 Better Explicit than Implicit 呢。主要是 format 功能性重要啦。

[ming2281]

楼主用过 ipython 没
如果没有，推荐试试，大部分问题都会烟消云散
你这种查帮助文档的问题，在 ipython 里面都不值一提

它非常强大，强大到它变成了我现在的默认 linux shell

[terence4444]

@ming2281 这台电脑我还要打游戏……公司里摸鱼写 Python 的电脑也是 Windows 的，所以没有 Linux ……

[terence4444]

在附言 1 中总结了这帖的内容，应该算是结帖了，撒花。