Largest Number LeetCode solution in Python

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from functools import cmp_to_key
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class Solution:
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    def largestNumber(self, nums: List[int]) -> str:
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        nums = list(map(str, nums))
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        nums = reversed(
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            sorted(
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                nums,
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                key=cmp_to_key(
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                    lambda x, y: (
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                        -1
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                        if int(x + y) < int(y + x)
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                        else (1 if int(x + y) > int(y + x) else 0)
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                    )
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                ),
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            )
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        )
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        res = "".join(nums)
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        return res if int(res) else "0"