Number of Good Pairs LeetCode solution in Python

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from itertools import combinations
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class Solution:
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    def numIdenticalPairs(self, nums) -> int:
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        res = 0
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        nums_set = set(nums)
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        nums_coppy = nums
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        for number in nums_set:
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            number_found = []
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            deleted = 0
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            while True:
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                try:
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                    found = nums_coppy.index(number)
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                    nums_coppy.remove(number)
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                    if deleted > 0:
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                        number_found.append(found + deleted)
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                    else:
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                        number_found.append(found + deleted)
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                    deleted += 1
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                except:
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                    comb = list(combinations(number_found, 2))
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                    res += len(comb)
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                    break
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        return res