python里单引号怎么打

>>> 'spam eggs'

'spam eggs'

>>> 'doesn\'t'  # 对可打印字符转义

"doesn't"

>>> "doesn\'t"  # 同上

"doesn't"

>>> "doesn't"  # 这样可以省去\

"doesn't"

>>> '"doesn\'t"'  # 嵌套后内部全部不进行转义

'"doesn\'t"'

>>> "\"Yes,\" he said."  # 同类型引号，需要进行转义

'"Yes," he said.'

>>> '"Yes," he said.'  # 这样可以省去\

'"Yes," he said.'

>>> '"Isn\'t," she said.'  # 嵌套后内部全部不进行转义

'"Isn\'t," she said.'

>>> print '"Isn\'t," she said.' # print对所有转义字符进行转义

"Isn't," she said.

>>> s='First line.\nSecond line.'

>>> s  # 对不可打印字符不进行转义

'First line.\nSecond line.'

>>> print s  # print对所有转义字符进行转义

First line.

Second line.