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.
Second line.'
>>> s # 对不可打印字符不进行转义
'First line.
Second line.'
>>> print s # print对所有转义字符进行转义
First line.
Second line.
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