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python代码`if not x:` 和`if x is not None:` …

Website URL: http://blog.csdn.net/sasoritattoo/article/details/12451359

Category: Sport Shoes

2013-10-8 · 代码中经常会有变量是否为None的判断，有三种主要的写法：第一种是`if x is None`；第二种是 `if not x：`；（非常容易出错的方式，一定不要养成这样写的习惯 ...