Python 中字符串可以使用单引号('……')或双引号("……")表示。反斜杠 \ 是转义字符。如果你不希望 \ 转义字符成特殊字符，可以在引号前添加 r 即可。如下所示：

"first_name"

# Output: first_name

'\'last_name\''

# Output: 'last_name'

# 没有特殊字符

path = r'd:\some\name'

# Output: d:\some\name

如果字符串很长，包括回车和换行用 ' 或 " 已经不能很好的表示。可以使用三重引号："""...""" 或 '''...'''。字符串中的回车换行会自动包含到字符串中，如果不想包含，在行尾添加一个 \ 即可。如下所示:

table = """\

CREATE TABLE `employees` (

`emp_no` int(11) NOT NULL AUTO_INCREMENT,"

`birth_date` date NOT NULL,"

`first_name` varchar(14) NOT NULL,"

`last_name` varchar(16) NOT NULL,"

`gender` enum('M','F') NOT NULL,"

`hire_date` date NOT NULL,"

PRIMARY KEY (`emp_no`)"

) ENGINE=InnoDB

"""

CREATE TABLE `employees` (

`emp_no` int(11) NOT NULL AUTO_INCREMENT,"

`birth_date` date NOT NULL,"

`first_name` varchar(14) NOT NULL,"

`last_name` varchar(16) NOT NULL,"

`gender` enum('M','F') NOT NULL,"

`hire_date` date NOT NULL,"

PRIMARY KEY (`emp_no`)"

) ENGINE=InnoDB

相邻两个或多个字符串将会自动连接到一起，该特性对很长的字符串拆开显示非常有用。如下所示:

text = (

"CREATE TABLE `salaries` ("

" `emp_no` int(11) NOT NULL,"

" `salary` int(11) NOT NULL,"

" `from_date` date NOT NULL,"

" `to_date` date NOT NULL,"

" PRIMARY KEY (`emp_no`,`from_date`), KEY `emp_no` (`emp_no`),"

" CONSTRAINT `salaries_ibfk_1` FOREIGN KEY (`emp_no`) "

" REFERENCES `employees` (`emp_no`) ON DELETE CASCADE"

") ENGINE=InnoDB")

CREATE TABLE `salaries` ( `emp_no` int(11) NOT NULL, `salary` int(11) NOT NULL, `from_date` date NOT NULL, `to_date` date NOT NULL, PRIMARY KEY (`emp_no`,`from_date`), KEY `emp_no` (`emp_no`), CONSTRAINT `salaries_ibfk_1` FOREIGN KEY (`emp_no`) REFERENCES `employees` (`emp_no`) ON DELETE CASCADE) ENGINE=InnoDB

与三重引号相比，合并后的字符串不会有换行回车，对执行拼装执行命令的字符串更有用。