base62

base62.py

# 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
# [0-9,a-z,A-Z] 62자로 구성되며 예측 난이도를 높이기 위해 무작위로 섞습니다.
BASE62 = "dCsuHTIWEcOPLhrgwBpRx4flv8JMKGDVmQ01qtejY9iNFzn5okX63aZAbySU27"

def encode(num, alphabet=BASE62):
        if num == 0:
            return alphabet[0]
        arr = []
        base = len(alphabet)
        while num:
            num, rem = divmod(num, base)
            arr.append(alphabet[rem])
        arr.reverse()
        return ''.join(arr)

def decode(string, alphabet=BASE62):
    base = len(alphabet)
    strlen = len(string)
    num = 0

    idx = 0
    for char in string:
        power = (strlen - (idx + 1))
        num += alphabet.index(char) * (base ** power)
        idx += 1

    return num