Python getting division by zero

Question

i try to calculate persentage , and show error float division by zero , and this my code

    d4 = float(self.qty_normal)+float(self.qty_abnormal)
    d3 = float(self.qty_normal)+float(self.qty_recoveryabn)
    if self.flag_recovery == False:
        if self.qty_abnormal and self.qty_normal:
            pnormal =(self.qty_normal)/float(d3)*(100.00)
            pabnormal =(self.qty_abnormal)/float(d3)*(100.00)
            self.nursery_persentagea = pabnormal
            self.nursery_persentagen = pnormal
    if self.flag_recovery == True:
        if self.qty_recoveryabn and self.qty_normal:
            pnormal =(self.qty_normal)/float(d3)*(100.00)
            pabnormal =(self.qty_recoveryabn)/float(d3)*(100.00)
            self.nursery_persentagea = pabnormal
            self.nursery_persentagen = pnormal

help me to solve this

Answer 1

You have several expressions which have the same denominator - d3. Check its value after the assignment:

 d3 = float(self.qty_normal)+float(self.qty_recoveryabn)

It should not be zero, otherwise this expression will fail to evaluate:

pnormal =(self.qty_normal)/float(d3)*(100.00)

OR

pnormal =(self.qty_normal)/float(d3)*(100.00)

(depends on flag_recovery etc.)