convert alphanumeric to numeric python
chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" #these are the digits you will use for conversion back and forth
charsLen = len(chars)
def numberToStr(num):
s = ""
while num:
s = chars[num % charsLen] + s
num //= charsLen
return(s)
def strToNumber(numStr):
num = 0
for i, c in enumerate(reversed(numStr)):
num += chars.index(c) * (charsLen ** i)
return(num)