python里单引号怎么打

实际上在Python中'...'和"..."是完全一样的，但不能出现'..."和"...'这种情况。 而将其混合使用会有很多意想不到的效果：

具体规则如下：

若字符串没有引号嵌套，则对可打印转义字符（\\,\',\",\ooo,\xhh）进行转义。

若字符串有引号嵌套，则对嵌套内部字符全部不进行转义，保持原始格式；对嵌套外部字符参照1进行转义。

注意print会对所有转义字符进行转义。

下面是几个有代表性的例子：

>>> '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.

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