Polish the content

Polish the chapter preface, introduction and complexity anlysis

codes/python/chapter_hashing/hash_map.py

@@ -12,38 +12,38 @@ from modules import *
 """Driver Code"""
 if __name__ == "__main__":
     # 初始化哈希表
-    mapp = dict[int, str]()
+    hmap = dict[int, str]()
 
     # 添加操作
     # 在哈希表中添加键值对 (key, value)
-    mapp[12836] = "小哈"
-    mapp[15937] = "小啰"
-    mapp[16750] = "小算"
-    mapp[13276] = "小法"
-    mapp[10583] = "小鸭"
+    hmap[12836] = "小哈"
+    hmap[15937] = "小啰"
+    hmap[16750] = "小算"
+    hmap[13276] = "小法"
+    hmap[10583] = "小鸭"
     print("\n添加完成后，哈希表为\nKey -> Value")
-    print_dict(mapp)
+    print_dict(hmap)
 
     # 查询操作
     # 向哈希表输入键 key ，得到值 value
-    name: str = mapp[15937]
+    name: str = hmap[15937]
     print("\n输入学号 15937 ，查询到姓名 " + name)
 
     # 删除操作
     # 在哈希表中删除键值对 (key, value)
-    mapp.pop(10583)
+    hmap.pop(10583)
     print("\n删除 10583 后，哈希表为\nKey -> Value")
-    print_dict(mapp)
+    print_dict(hmap)
 
     # 遍历哈希表
     print("\n遍历键值对 Key->Value")
-    for key, value in mapp.items():
+    for key, value in hmap.items():
         print(key, "->", value)
 
     print("\n单独遍历键 Key")
-    for key in mapp.keys():
+    for key in hmap.keys():
         print(key)
 
     print("\n单独遍历值 Value")
-    for val in mapp.values():
+    for val in hmap.values():
         print(val)