Design an Ordered Stream LeetCode solution in Python

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class OrderedStream:
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    def __init__(self, n: int):
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        self.seen = {}
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        self.ptr = 1
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    def insert(self, id: int, value: str) -> List[str]:
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        seen, ptr = self.seen, self.ptr
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        seen[id] = value
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        result = []
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        while ptr in seen:
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            result.append(seen[ptr])
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            del seen[ptr]
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            ptr += 1
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        self.ptr = ptr
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        return result
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# Your OrderedStream object will be instantiated and called as such:
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# obj = OrderedStream(n)
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# param_1 = obj.insert(id,value)