Design Skiplist LeetCode solution in Python

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# Runtime: 3867 ms (Top 5.16%) | Memory: 20.8 MB (Top 90.23%)
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class Skiplist:
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    def __init__(self):
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        self.data = []
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    def search(self, target: int) -> bool:
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        if target in self.data:
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            return True
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        else:
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            return False
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    def add(self, num: int) -> None:
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        self.data.append(num)
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    def erase(self, num: int) -> bool:
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        for i in range(len(self.data)):
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            if self.data[i] == num:
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                self.data.pop(i)
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                return True
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        if num not in self.data:
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            return False