嗡嘛呢巴美吽舍

摘要： Use is when you want to check against an object's identity (e.g. checking to see if var is None). Use == when you want to check equality (e.g. Is var  阅读全文

摘要： There is a simple rule of thumb to tell you when to use == or is. == is for value equality. Use it when you would like to know if two objects have the 阅读全文