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Python 字符串定义

Jun 06, 2016 am 11:26 AM
python string

例如:'string'、"string"、"""string"""或者是'''string'''。
在使用上,单引号和双引号没有什么区别。三引号的主要功能是在字符串中可以包含换行。也就是说,在三引号中的字符串,如果其中的内容在程序中是分行的,那么,在使用中也是分行的。这样就不需要显示的使用"\n"来换行了。

像多数编程语言一样,python中的字符串是不可变的。同样,对于转移字符的处理,也和其他语言类似。如“ 'What's your name?' ”,在这个字符串内部,出现了“ ' ”字符,对于这个字符,可以使用'\'字符转移: 'What\'s your name?',或者使用双引号代替字符串定义: "What's your name?"。经常使用的方式是用'\'来转移字符。可以使用'\n'来定义表示一个换行,'\t'表示一个tab,'\\'表示一个真实的'\'字符。

对于字符串,有一个非常有用的format方法。这个方法的主要用途是代替丑陋的"+"字符串连接。例如"my name is {0}".format("联合国"),那么,这个字符串的真实值就是"my name is 联合国"。这样,就可以在运行时替换这个字符串的内容。同时,也可以使用命名参数的形式来替换,例如:"my name is {name}".format(name="联合国")。

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