Largest Number At Least Twice of Others LeetCode solution in Python

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# Runtime: 40 ms (Top 86.73%) | Memory: 13.8 MB (Top 57.55%)
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class Solution:
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    def dominantIndex(self, nums: List[int]) -> int:
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        if len(nums) is 1:
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            return 0
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        dom = max(nums)
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        i = nums.index(dom)
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        nums.remove(dom)
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        if max(nums) * 2 <= dom:
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            return i
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        return -1