python应用操作——多行字符串

基本的方式是使用源于 C 语言的反斜杠：

In [20]: multistr = " select * from multi_row \

    ...: where row_id < 5"

In [21]: multistr

Out[21]: ' select * from multi_row where row_id < 5'

另一个技巧是使用三引号

In [23]: multistr ="""select * from multi_row

    ...: where row_id < 5"""

In [24]: multistr

Out[24]: 'select * from multi_row \nwhere row_id < 5'

上面方法共有的问题是缺少合适的缩进，如果我们尝试缩进会在字符串中插入空格。所以最后的解决方案是将字符串分为多行并且将整个字符串包含在括号中：

In [25]: multistr = ("select * from multi_row "

    ...: "where row_id < 5 "

    ...: "order by age")  

In [26]: multistr

Out[26]: 'select * from multi_row where row_id < 5 order by age'