定义字符串

前面我们讲解了什么是字符串。字符串可以用''或者""括起来表示。

如果字符串本身包含'怎么办?比如我们要表示字符串 I'm OK ,这时,可以用" "括起来表示:

"I'm OK"

类似的,如果字符串包含",我们就可以用' '括起来表示:

'Learn "Python" in imooc'

如果字符串既包含'又包含"怎么办?

这个时候,就需要对字符串的某些特殊字符进行“转义”,Python字符串用\进行转义。

要表示字符串 Bob said "I'm OK".
由于 ' 和 " 会引起歧义,因此,我们在它前面插入一个\表示这是一个普通字符,不代表字符串的起始,因此,这个字符串又可以表示为

'Bob said \"I\'m OK\".'

注意:转义字符 \ 不计入字符串的内容中。

常用的转义字符还有:

\n 表示换行
\t 表示一个制表符
\\ 表示 \ 字符本身

任务

请将下面两行内容用Python的字符串表示并打印出来:

  Python was started in 1989 by "Guido".

  Python is free and easy to learn.

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" 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raw字符串与多行字符串

如果一个字符串包含很多需要转义的字符,对每一个字符都进行转义会很麻烦。为了避免这种情况,我们可以在字符串前面加个前缀 r ,表示这是一个 raw 字符串,里面的字符就不需要转义了。例如:

r'\(~_~)/ \(~_~)/'

但是r'...'表示法不能表示多行字符串,也不能表示包含'"的字符串(为什么?)

如果要表示多行字符串,可以用'''...'''表示:

'''Line 1
Line 2
Line 3'''

上面这个字符串的表示方法和下面的是完全一样的:

'Line 1\nLine 2\nLine 3'

还可以在多行字符串前面添加 r ,把这个多行字符串也变成一个raw字符串:

r'''Python is created by "Guido".
It is free and easy to learn.
Let's start learn Python in imooc!'''

任务

请把下面的字符串用r'''...'''的形式改写,并用print打印出来:

'\"To be, or not to be\": that is the question.\nWhether it\'s nobler in the mind to suffer.'

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" 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