How would you convert the History Referencing Operator into Python?

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梦如初夏
梦如初夏 2021-02-14 07:35
xsa(src,len,wei) =>
    sumf = 0.0
    ma = 0.0
    out = 0.0
    sumf  :=  nz(sumf[1]) - nz(src[len]) + src
    ma  :=  na(src[len]) ? na : sumf/len
    out  :=  na(         


        
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