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not_empty(s)函数有点不明白

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贝司特曼

#1 Created at ... [Delete] [Delete and Lock User] 
def not_empty(s):
    return s and s.strip()

单独测试的情况下，函数返回的不是布尔值，为什么能做筛选呢？

廖雪峰

#2 Created at ... [Delete] [Delete and Lock User]

Python把None, 0, ''当作布尔的False，其他都是True

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