单引号字符串与双引号字符串 [英] Single quoted string vs. double quoted string

问题描述

为什么单引号字符串需要转义字符，而双引号字符串则不需要转义字符？

Why do we need an escape character for single quoted string, but not for a double quoted string?

a = 'hello how\'s it going'
a1 = 'hello how's it going'
b =  "hello how's it going"

assert(a==b) # Passes

assert(a1==b) # Errors

错误消息：

 File "string.py", line 1
    a = 'hello how's it going'
                  ^
SyntaxError: invalid syntax

推荐答案

使用没关系'或 将其标记为字符串文字，但是您不能在字符串文字中使用该字符，除非使用 \ 在它前面-否则Python会将其解释为字符串的结尾。

It doesn't matter if you use ' or " around the string to mark it as string literal. But you can't use that character inside the string literal without escaping it using a \ in front of it - otherwise Python interprets it as the end of the string.

例如<$在 分隔的字符串文字内的c $ c> c>也需要转义：

For example " inside a " delimited string literal need to be escaped as well:

a = "And he said: \"What a nice day\"."

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