Convert a Number to Hexadecimal LeetCode solution in Python

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# Runtime: 33 ms (Top 88.95%) | Memory: 13.8 MB (Top 62.28%)
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class Solution:
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    def toHex(self, num: int) -> str:
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        ret = [
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            "0",
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            "1",
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            "2",
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            "3",
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            "4",
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            "5",
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            "6",
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            "7",
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            "8",
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            "9",
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            "a",
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            "b",
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            "c",
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            "d",
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            "e",
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            "f",
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        ]
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        ans = ""
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        if num < 0:
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            num = pow(2, 32) + num
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        if num == 0:
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            return "0"
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        while num > 0:
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            ans = ret[num % 16] + ans
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            num = num // 16
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        return ans