convert_to_hex.py

class Solution:
    def toHex(self, num: int) -> str:
        if num == 0:
            return "0"
        if num < 0:
            num = (1 << 32) + num

        hex_digits = "0123456789abcdef"

        hex_num = ""

        while num > 0:
            digit = num % 16
            hex_digit = hex_digits[digit]
            hex_num = hex_digit + hex_num
            num //= 16

        return hex_num