Add the codes of hashmap (#553)

of chaining and open addressing

codes/python/chapter_hashing/array_hash_map.py

@@ -5,8 +5,8 @@ Author: msk397 (machangxinq@gmail.com)
 """
 
 
-class Entry:
-    """键值对 int->String"""
+class Pair:
+    """键值对"""
 
     def __init__(self, key: int, val: str):
         self.key = key
@@ -19,7 +19,7 @@ class ArrayHashMap:
     def __init__(self):
         """构造方法"""
         # 初始化数组，包含 100 个桶
-        self.buckets: list[Entry | None] = [None] * 100
+        self.buckets: list[Pair | None] = [None] * 100
 
     def hash_func(self, key: int) -> int:
         """哈希函数"""
@@ -29,26 +29,26 @@ class ArrayHashMap:
     def get(self, key: int) -> str:
         """查询操作"""
         index: int = self.hash_func(key)
-        pair: Entry = self.buckets[index]
+        pair: Pair = self.buckets[index]
         if pair is None:
             return None
         return pair.val
 
-    def put(self, key: int, val: str) -> None:
+    def put(self, key: int, val: str):
         """添加操作"""
-        pair = Entry(key, val)
+        pair = Pair(key, val)
         index: int = self.hash_func(key)
         self.buckets[index] = pair
 
-    def remove(self, key: int) -> None:
+    def remove(self, key: int):
         """删除操作"""
         index: int = self.hash_func(key)
         # 置为 None ，代表删除
         self.buckets[index] = None
 
-    def entry_set(self) -> list[Entry]:
+    def entry_set(self) -> list[Pair]:
         """获取所有键值对"""
-        result: list[Entry] = []
+        result: list[Pair] = []
         for pair in self.buckets:
             if pair is not None:
                 result.append(pair)
@@ -70,7 +70,7 @@ class ArrayHashMap:
                 result.append(pair.val)
         return result
 
-    def print(self) -> None:
+    def print(self):
         """打印哈希表"""
         for pair in self.buckets:
             if pair is not None: