def toHex(num):

        """

        :type num: int

        :rtype: str

        """

        chaDic = {: 'a', : 'b', : 'c', : 'd', : 'e', : 'f'}

        hexStr = ""

        if num < :

            num = num + **

        while num >= :

            digit = num %

            hexStr = chaDic.get(digit, str(digit)) + hexStr

            num //= 16

        hexStr = chaDic.get(num, str(num)) + hexStr

        return hexStr

print("转换前")

print()

a=toHex()

print("转换后")

print(a)

print("还原")

print(int(a,))

bogon:Desktop macname$ python3 test.py

转换前

转换后

还原