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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