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第 21 期:match case——Python 版 switch 语句

  • 2026-06-28 09:37:32
第 21 期:match case——Python 版 switch 语句

📝 预计阅读时间:25 分钟 | 难度:⭐⭐⭐☆☆


🎯 学习目标

完成本课后,你将能够:

  • ✅ 理解 match case 的概念
  • ✅ 掌握 match case 的基本语法
  • ✅ 使用模式匹配处理各种数据类型
  • ✅ 使用通配符和守卫条件
  • ✅ 替代复杂的 if-elif 链
  • ✅ 实战:命令解析器

📋 课前回顾

在第 19 期中,我们学习了:

  • ✅ with 语句的基本语法
  • ✅ 文件操作的自动管理
  • ✅ 上下文管理器的实现
  • ✅ 实战:配置文件管理器
# with 语句示例
with open("data.txt""r"as f:
    content = f.read()
# 自动关闭文件

今天,我们学习 Python 3.10+ 的新特性——match case


📚 课程内容

1. 什么是 match case?

1.1 模式匹配的本质

match case 是 Python 3.10 引入的结构化模式匹配特性,类似于其他语言的 switch-case,但更强大。

# 传统 if-elif 链
status = 404
if status == 200:
    print("OK")
elif status == 404:
    print("Not Found")
elif status == 500:
    print("Server Error")
else:
    print("Unknown")

# match case 方式(更清晰)
match status:
    case 200:
        print("OK")
    case 404:
        print("Not Found")
    case 500:
        print("Server Error")
    case _:
        print("Unknown")

2. match case 基础

2.1 基本语法

match 表达式:
    case 模式 1:
# 代码块 1
    case 模式 2:
# 代码块 2
    case _:
# 默认代码块(可选)

2.2 字面量匹配

defhttp_status(status):
    match status:
        case 200:
return"OK"
        case 404:
return"Not Found"
        case 500:
return"Server Error"
        case _:
return"Unknown"

print(http_status(200))  # OK
print(http_status(404))  # Not Found

3. 序列模式匹配

3.1 列表匹配

defcheck_command(command):
    match command:
        case ["start"]:
return"启动系统"
        case ["stop"]:
return"停止系统"
        case ["restart", delay]:
returnf"{delay}秒后重启"
        case _:
return"未知命令"

print(check_command(["start"]))        # 启动系统
print(check_command(["restart"10]))  # 10 秒后重启

3.2 元组匹配

defprocess_point(point):
    match point:
        case (00):
return"原点"
        case (x, 0):
returnf"x 轴上的点 ({x}, 0)"
        case (0, y):
returnf"y 轴上的点 (0, {y})"
        case (x, y):
returnf"点 ({x}{y})"
        case _:
return"无效点"

4. 字典模式匹配

defprocess_user(user):
    match user:
        case {"name": name, "age": age}:
returnf"{name}{age}岁"
        case {"name": name}:
returnf"{name}(年龄未知)"
        case _:
return"未知用户"

print(process_user({"name""张三""age"25}))  # 张三,25 岁
print(process_user({"name""李四"}))             # 李四(年龄未知)

5. 守卫条件

defcheck_score(score):
    match score:
        case s if s >= 90:
return"优秀"
        case s if s >= 80:
return"良好"
        case s if s >= 60:
return"及格"
        case _:
return"不及格"

6. 实战:命令解析器

6.1 场景描述

创建一个命令解析器,使用 match case 处理各种用户命令。

6.2 实现代码

classCommandParser:
"""命令解析器"""

defparse(self, command):
"""解析命令"""
        parts = command.strip().split()

ifnot parts:
return"请输入命令"

        match parts:
            case ["help"]:
return self.show_help()

            case ["add", item]:
returnf"添加:{item}"

            case ["add", item, quantity] if quantity.isdigit():
returnf"添加{quantity}{item}"

            case ["remove", item]:
returnf"删除:{item}"

            case ["list"]:
return"显示列表"

            case ["search", keyword]:
returnf"搜索:{keyword}"

            case ["exit" | "quit"]:
return"退出系统"

            case _:
returnf"未知命令:{command}"

defshow_help(self):
"""显示帮助"""
return"""
可用命令:
  help          - 显示帮助
  add <物品>     - 添加物品
  add <物品> <数量> - 添加指定数量的物品
  remove <物品>  - 删除物品
  list          - 显示列表
  search <关键词> - 搜索
  exit/quit     - 退出
"""


# 测试
parser = CommandParser()
commands = [
"help",
"add 苹果",
"add 香蕉 5",
"remove 橙子",
"list",
"search 苹果",
"exit",
"unknown",
]

for cmd in commands:
    print(f"> {cmd}")
    print(f"  {parser.parse(cmd)}\n")

📝 课后练习

练习 1:HTTP 状态码

# 根据 HTTP 状态码返回描述
defhttp_status(status):
pass

print(http_status(200))  # OK
print(http_status(404))  # Not Found

练习 2:形状面积计算

# 根据形状计算面积
defcalculate_area(shape):
pass

print(calculate_area(("circle"5)))      # 圆,半径 5
print(calculate_area(("rect"45)))     # 矩形,4×5

练习 3:数据类型判断

# 使用 match case 判断数据类型
defcheck_type(value):
pass

📚 总结

核心知识点

类别
关键内容
match 语法
match 表达式:
 + case 模式:
字面量匹配
匹配具体值
序列匹配
匹配列表、元组
字典匹配
匹配字典结构
守卫条件
case x if 条件:
通配符
case _:

🚀 下一步

第 22 期:assert——断言调试利器!


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  1. CONNECT:[ UseTime:0.000597s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000706s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000309s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000257s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000642s ]
  8. SELECT * FROM `article` WHERE `id` = 499040 LIMIT 1 [ RunTime:0.000732s ]
  9. UPDATE `article` SET `lasttime` = 1783021637 WHERE `id` = 499040 [ RunTime:0.009646s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000274s ]
  11. SELECT * FROM `article` WHERE `id` < 499040 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000468s ]
  12. SELECT * FROM `article` WHERE `id` > 499040 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000643s ]
  13. SELECT * FROM `article` WHERE `id` < 499040 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001258s ]
  14. SELECT * FROM `article` WHERE `id` < 499040 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000942s ]
  15. SELECT * FROM `article` WHERE `id` < 499040 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001294s ]
0.090785s