convert between bases python

1# add as many different characters as you want
2alpha = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
3
4
5def convert(num, base=2):
6    assert base <= len(alpha), f"Unable to convert to base {base}"
7    converted = ""
8    while num > 0:
9        converted += alpha[num % base]
10        num //= base
11
12    if len(converted) == 0:
13        return "0"
14    return converted[::-1]
15  
16
17print(convert(15, 8))  # 17

1chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" #these are the digits you will use for conversion back and forth
2charsLen = len(chars)
3
4def numberToStr(num):
5  s = ""
6  while num:
7    s = chars[num % charsLen] + s
8    num //= charsLen
9
10  return(s)
11
12def strToNumber(numStr):
13  num = 0
14  for i, c in enumerate(reversed(numStr)):
15    num += chars.index(c) * (charsLen ** i)
16
17  return(num)