python字符串

python字符串，可以用成对的单引号('......')或双引号("......")来标示（标示类型为字符串）

如果字符串内部存在特殊字符，例如单引号或双引号，遵循以下规则：

1. 如果字符串使用成对的单引号来标示，字符串内部的单引号字符一定要用转义字符，字符串内部的双引号字符可以不用转义字符

2. 如果字符串使用成对的双引号来标示，字符串内部的单引号字符可以不用转义字符，字符串内部的双引号字符一定要用转义字符

示例：

>>> '"Isn\'t," they said.'
'"Isn\'t," they said.'

 

>>> mystring = '"Isn\'t," they said.'
>>> print(mystring)
"Isn't," they said.

 

>>> r'"Isn\'t," they said.'                   //r表示原始字符串，\'使用转义解释器就不会误认为是字符串结束符
'"Isn\\\'t," they said.'

 

>>> mystring = r'"Isn\'t," they said.'
>>> print (mystring)
"Isn\'t," they said.