[Tutor] calculate percents of items in a list

[LN A-go-go]

What would be a better way to calculate percentages of items in a list?
please....

CountList = [9221382, 10374466, 5192905, 1710238, 3359]
CL = [float(i) for i in CountList]
CL
sum = CL[0] + CL[1] + CL[2] + CL[3] + CL[4]
import math
perList = []
n = 0
def percentage(CL,sum):
 for i in CL:
     PER = "return 100 * float (CL[0])/float (sum)"
     perList.append(PER)
     n = n + 1
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