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118 lines
3.2 KiB
118 lines
3.2 KiB
"""
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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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import sys, os.path as osp
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sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
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from modules import *
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class Entry:
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""" 键值对 int->String """
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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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""" 基于数组简易实现的哈希表 """
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def __init__(self):
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""" 构造方法 """
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# 初始化一个长度为 100 的桶（数组）
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self.buckets: List[Optional[Entry]] = [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: int = 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: Entry = 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) -> None:
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""" 添加操作 """
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pair = Entry(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) -> None:
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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[Entry]:
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""" 获取所有键值对 """
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result: List[Entry] = []
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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: List[int] = []
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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: List[str] = []
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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) -> None:
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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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mapp = 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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mapp.put(12836, "小哈")
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mapp.put(15937, "小啰")
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mapp.put(16750, "小算")
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mapp.put(13276, "小法")
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mapp.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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mapp.print()
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""" 查询操作 """
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# 向哈希表输入键 key ，得到值 value
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name = mapp.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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mapp.remove(10583)
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print("\n删除 10583 后，哈希表为\nKey -> Value")
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mapp.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 mapp.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 mapp.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 mapp.value_set():
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print(val)
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