摘要： 比较字符串的时候发现'is'和'=='在比较字符串的时候的效果是不一样的http://stackoverflow.com/questions/2988017/string-comparison-in-python-is-vs 里面说You use == when comparing values and is when comparing identities.When comparing ints (or immutable types in general), you pretty much always want the former. There' 阅读全文