HighBaseEncodedURLs.py

class HighBaseEncoder(object):
    """docstring for HighBaseEncoder
       http://stackoverflow.com/questions/1119722/base-62-conversion-in-python
    """

    def __init__(self):
        super(HighBaseEncoder, self).__init__()
        
    ALPHABET = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ"

    @classmethod
    def encode(cls, num, alphabet=None):
        """Encode a number in Base X

        `num`: The number to encode
        `alphabet`: The alphabet to use for encoding
        """
        if not alphabet:
            alphabet = cls.ALPHABET
        if (num == 0):
            return alphabet[0]
        arr = []
        base = len(alphabet)
        while num:
            rem = num % base
            num = num // base
            arr.append(alphabet[rem])
        arr.reverse()
        return ''.join(arr)

    @classmethod
    def decode(cls, string, alphabet=None):
        """Decode a Base X encoded string into the number

        Arguments:
        - `string`: The encoded string
        - `alphabet`: The alphabet to use for encoding
        """
        if not alphabet:
            alphabet = cls.ALPHABET
        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