I want to know if there is any faster way to do the following loop? Maybe use apply or rolling apply function to realize this Basically, I need to access previous row's value to determine current cell value.I want to know if there is any faster way to do
阅读背景：
Pandas DataFrame使用先前的行值来处理复杂的“if”条件以确定当前值
来源：互联网
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