405. Convert a Number to Hexadecimal.py

class Solution:
    def toHex(self, num: int) -> str:
        if num == 0: 
            return '0'
        
        map = '0123456789abcdef'
        result = ''
        
        # If negative number, use two's compliment
        if num < 0: 
            num += 2 ** 32
            
        while num > 0:
            digit = num % 16
            num = (num - digit) // 16
            result += str(map[digit])

        return result[::-1]