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112 lines
2.7 KiB
Python
112 lines
2.7 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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# 键值对 int->String
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class Entry:
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def __init__(self, key, val):
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self.key = key
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self.val = val
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# 基于数组简易实现的哈希表
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class ArrayHashMap:
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def __init__(self):
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# 初始化一个长度为 100 的桶（数组）
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self.bucket = [None] * 100
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# 哈希函数
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def hashFunc(self, key):
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index = key % 100
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return index
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# 查询操作
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def get(self, key):
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index = self.hashFunc(key)
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pair = self.bucket[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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# 添加操作
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def put(self, key, val):
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pair = Entry(key, val)
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index = self.hashFunc(key)
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self.bucket[index] = pair
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# 删除操作
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def remove(self, key):
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index = self.hashFunc(key)
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# 置为空字符，代表删除
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self.bucket[index] = None
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# 获取所有键值对
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def entrySet(self):
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result = []
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for pair in self.bucket:
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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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# 获取所有键
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def keySet(self):
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result = []
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for pair in self.bucket:
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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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# 获取所有值
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def valueSet(self):
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result = []
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for pair in self.bucket:
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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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# 打印哈希表
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def print(self):
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for pair in self.bucket:
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if pair is not None:
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print(pair.key, "->", pair.val)
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if __name__ == "__main__":
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""" 初始化哈希表 """
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Map = 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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Map.put(12836, "小哈")
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Map.put(15937, "小啰")
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Map.put(16750, "小算")
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Map.put(13276, "小法")
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Map.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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Map.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 = Map.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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Map.remove(10583)
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print("\n删除 10583 后，哈希表为\nKey -> Value")
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Map.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 Map.entrySet():
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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 Map.keySet():
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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 Map.valueSet():
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print(val)
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