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Python 语法第七课:字典与集合

  • 2026-08-20 03:11:36
Python 语法第七课:字典与集合
在第六课用列表和元组按“位置”管理数据。但想象一下,如果要存储全班同学的姓名和成绩,用两个列表分别存名字和分数,再通过相同的索引去对应,不仅麻烦还极易出错。有没有一种方式,能像查字典一样,通过“姓名”直接查到“成绩”?
今天,我们将学习Python中最强大的两种数据结构——字典(dict)和 集合(set)。字典让你实现“键值对”的精准映射,集合则帮你轻松完成数据去重与集合运算。

一、字典 dict:键值对的“智能词典”

字典用花括号 {} 定义,以 键: 值 的形式存储数据。它的核心特性是:通过键(key)快速访问值(value),且键必须唯一

1. 创建与访问

student = {"name""小明""age": 18, "score": 92}print(student["name"])     # 输出:小明print(student.get("age"))  # 输出:18(推荐用 get,更安全)print(student.get("gender""未知"))  # 键不存在时返回默认值"未知"

2. 常用操作:增删改查

# ➕ 增加 / ✏️ 修改(键存在则修改,不存在则新增)student["gender"] = "男"student["score"] = 95# ❌ 删除del student["age"]           # 按键删除popped = student.pop("name"# 弹出并返回指定键的值# 🔍 查询print(len(student))          # 获取键值对数量print("score" in student)    # 判断键是否存在(注意:检查的是键,不是值)# 🔄 遍历for key, value in student.items():    print(f"{key}{value}")

3. 字典的键有什么要求?

  • 必须是不可变类型
    :字符串、数字、元组都可以做键;列表不能做键(因为列表可变)。
  • 必须唯一
    :同一个字典中不能有重复的键,后出现的会覆盖前面的。

三、字典 vs 集合 vs 列表:如何选择?

四、实战:通讯录管理器

综合运用字典操作和函数封装,写一个实用的通讯录工具:

def contact_book():    contacts = {}  # 创建空字典    while True:        cmd = input("\n命令(add/find/list/del/quit):").strip().lower()        if cmd == "add":            name = input("姓名:").strip()            phone = input("电话:").strip()            contacts[name] = phone            print(f"✅ 已保存 {name} 的联系方式")        elif cmd == "find":            name = input("要查找的姓名:").strip()            phone = contacts.get(name)            if phone:                print(f"📞 {name} 的电话:{phone}")            else:                print(f"❌ 未找到 {name} 的记录")        elif cmd == "list":            if contacts:                print("📒 通讯录:")                for name, phone in contacts.items():                    print(f"  {name}{phone}")            else:                print("📭 通讯录为空")        elif cmd == "del":            name = input("要删除的姓名:").strip()            if name in contacts:                del contacts[name]                print(f"🗑️ 已删除 {name}")            else:                print(f"❌ {name} 不存在")        elif cmd == "quit":            print("👋 再见!")            break        else:            print("❌ 无效命令")contact_book()

五、新手避坑指南

  1. 空集合写成 {}
    {} 是空字典,空集合必须用 set()
  2. 用列表做字典的键
    :列表可变,不能作为键。如果需要,先转成元组 tuple(list)
  3. 遍历时修改字典
    :不要在 for key in dict 循环中直接增删键,会导致 RuntimeError。正确做法是先收集要操作的键,循环结束后再统一处理。
  4. 混淆 in 的检查对象
    x in dict 检查的是,不是值。检查值需要用 x in dict.values()
  5. 忽略字典的无序性(Python < 3.7)
    :虽然 Python 3.7+ 字典保持插入顺序,但不要依赖这个特性做逻辑判断,尤其是需要兼容旧版本时。

六、总结

  • 字典 dict
    :键值对映射,精准查找,键必须唯一且不可变。
  • 集合 set
    :自动去重,支持交并差运算,无序且不重复。
  • 安全访问
    :永远优先使用 dict.get() 而非 dict[]
  • 选择原则
    :查对应关系用字典,去重/集合运算用集合,有序可重复用列表。

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  1. CONNECT:[ UseTime:0.000925s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001373s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005073s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000709s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001414s ]
  6. SELECT * FROM `set` [ RunTime:0.000635s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001526s ]
  8. SELECT * FROM `article` WHERE `id` = 507008 LIMIT 1 [ RunTime:0.001472s ]
  9. UPDATE `article` SET `lasttime` = 1787317336 WHERE `id` = 507008 [ RunTime:0.018753s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000578s ]
  11. SELECT * FROM `article` WHERE `id` < 507008 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001850s ]
  12. SELECT * FROM `article` WHERE `id` > 507008 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.042815s ]
  13. SELECT * FROM `article` WHERE `id` < 507008 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002035s ]
  14. SELECT * FROM `article` WHERE `id` < 507008 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002143s ]
  15. SELECT * FROM `article` WHERE `id` < 507008 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.120479s ]
0.374144s