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f68bbb0d59
* Revised the book * Update the book with the second revised edition * Revise base on the manuscript of the first edition
117 lines
2.9 KiB
Python
117 lines
2.9 KiB
Python
"""
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File: array_hash_map.py
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Created Time: 2022-12-14
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Author: msk397 (machangxinq@gmail.com)
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"""
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class Pair:
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"""键值对"""
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def __init__(self, key: int, val: str):
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self.key = key
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self.val = val
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class ArrayHashMap:
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"""基于数组实现的哈希表"""
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def __init__(self):
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"""构造方法"""
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# 初始化数组，包含 100 个桶
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self.buckets: list[Pair | None] = [None] * 100
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def hash_func(self, key: int) -> int:
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"""哈希函数"""
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index = key % 100
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return index
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def get(self, key: int) -> str:
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"""查询操作"""
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index: int = self.hash_func(key)
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pair: Pair = self.buckets[index]
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if pair is None:
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return None
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return pair.val
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def put(self, key: int, val: str):
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"""添加操作"""
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pair = Pair(key, val)
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index: int = self.hash_func(key)
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self.buckets[index] = pair
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def remove(self, key: int):
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"""删除操作"""
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index: int = self.hash_func(key)
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# 置为 None ，代表删除
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self.buckets[index] = None
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def entry_set(self) -> list[Pair]:
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"""获取所有键值对"""
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result: list[Pair] = []
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for pair in self.buckets:
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if pair is not None:
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result.append(pair)
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return result
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def key_set(self) -> list[int]:
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"""获取所有键"""
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result = []
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for pair in self.buckets:
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if pair is not None:
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result.append(pair.key)
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return result
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def value_set(self) -> list[str]:
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"""获取所有值"""
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result = []
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for pair in self.buckets:
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if pair is not None:
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result.append(pair.val)
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return result
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def print(self):
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"""打印哈希表"""
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for pair in self.buckets:
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if pair is not None:
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print(pair.key, "->", pair.val)
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"""Driver Code"""
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if __name__ == "__main__":
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# 初始化哈希表
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hmap = ArrayHashMap()
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# 添加操作
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# 在哈希表中添加键值对 (key, value)
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hmap.put(12836, "小哈")
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hmap.put(15937, "小啰")
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hmap.put(16750, "小算")
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hmap.put(13276, "小法")
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hmap.put(10583, "小鸭")
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print("\n添加完成后，哈希表为\nKey -> Value")
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hmap.print()
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# 查询操作
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# 向哈希表中输入键 key ，得到值 value
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name = hmap.get(15937)
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print("\n输入学号 15937 ，查询到姓名 " + name)
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# 删除操作
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# 在哈希表中删除键值对 (key, value)
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hmap.remove(10583)
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print("\n删除 10583 后，哈希表为\nKey -> Value")
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hmap.print()
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# 遍历哈希表
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print("\n遍历键值对 Key->Value")
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for pair in hmap.entry_set():
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print(pair.key, "->", pair.val)
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print("\n单独遍历键 Key")
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for key in hmap.key_set():
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print(key)
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print("\n单独遍历值 Value")
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for val in hmap.value_set():
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print(val)
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