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【Python】Day12:字符串方法进阶与元组、集合

  • 2026-07-02 16:32:52
【Python】Day12:字符串方法进阶与元组、集合

🎯 学习目标

  1. 掌握字符串常用方法:split()join()replace()strip()find()
  2. 理解元组的特点:不可变的有序序列,以及与列表的区别
  3. 理解集合的特点:无序、不重复,掌握集合运算
  4. 能在不同场景下选择合适的数据类型:列表 vs 元组 vs 集合 vs 字典

一、字符串方法进阶

  1. split():拆分字符串为列表
    # 默认按空白字符(空格、制表符、换行)拆分text = "Hello World Python"words = text.split()print(words)              # ['Hello', 'World', 'Python']# 指定分隔符csv = "苹果,香蕉,橘子,葡萄"fruits = csv.split(",")print(fruits)             # ['苹果', '香蕉', '橘子', '葡萄']# 限制拆分次数info = "小王,18,北京,编程"result = info.split(","2)    # 最多拆2次print(result)             # ['小王', '18', '北京,编程']
  2. join():把列表合并成字符串(split 的逆操作)
    # 用指定字符串连接列表元素words = ["Hello""World""Python"]sentence = " ".join(words)print(sentence)           # Hello World Pythonfruits = ["苹果""香蕉""橘子"]result = "、".join(fruits)print(result)             # 苹果、香蕉、橘子# 常见场景:把数字列表转成逗号分隔的字符串nums = [12345]print(",".join(str(n) for n in nums))  # 1,2,3,4,5
  3. replace():替换子串
    text = "I love Java"new_text = text.replace("Java""Python")print(new_text)           # I love Pythonprint(text)               # I love Java  原字符串不变!# 替换所有匹配项text = "aaa-bbb-aaa"print(text.replace("aaa""ccc"))    # ccc-bbb-ccc# 限制替换次数print(text.replace("aaa""ccc"1)) # ccc-bbb-aaa
  4. strip()/lstrip()rstrip():去除首尾空白字符
    # strip:去除两端空白text = "  Hello World  "print(text.strip())       # "Hello World"print(text.lstrip())     # "Hello World  "print(text.rstrip())     # "  Hello World"# 指定去除的字符text = "###Hello###"print(text.strip("#"))    # Hello# 常见场景:清理用户输入name = input("请输入名字:").strip()   # 去掉首尾多余空格
  5. find()rfind():查找子串位置
    text = "Hello World World"# find:从左找第一个出现的位置,返回索引print(text.find("World"))     # 6print(text.find("Python"))    # -1  找不到返回 -1,不报错# rfind:从右找最后一个出现的位置print(text.rfind("World"))    # 12# 指定查找范围print(text.find("World"7))  # 12  从索引7开始找
  6. startswith()endswith():判断首尾
    filename = "report.pdf"print(filename.endswith(".pdf"))     # Trueprint(filename.endswith(".txt"))     # Falseprint(filename.startswith("report")) # True# 常见场景:判断文件类型url = "https://example.com"print(url.startswith("https://"))    # True
  7. upper()/lower()title():大小写转换
    text = "hello WORLD python"print(text.upper())        # HELLO WORLD PYTHONprint(text.lower())        # hello world pythonprint(text.title())        # Hello World Pythonprint(text.capitalize())   # Hello world python(只首字母大写)print(text.swapcase())     # HELLO world PYTHON(大小写互换)
  8. count():统计子串出现次数
    text = "banana"print(text.count("a"))     # 3print(text.count("na"))    # 2print(text.count("x"))     # 0
  9. isdigit()isalpha()isalnum():类型判断
    print("123".isdigit())     # True   只含数字print("abc".isalpha())     # True   只含字母print("abc123".isalnum())  # True   只含字母或数字print("abc 123".isalnum()) # False  含空格# 常见场景:验证用户输入age = input("请输入年龄:")if age.isdigit():    print(f"你输入的年龄是 {int(age)}")else:    print("请输入有效的数字!")
  10. 字符串方法速查表
    方法
    作用
    返回值
    split(sep)
    按分隔符拆分
    列表
    join(列表)
    用字符串连接列表
    字符串
    replace(old, new)
    替换子串
    新字符串
    strip()
    去首尾空白
    新字符串
    find(sub)
    查找子串位置
    索引或 -1
    count(sub)
    统计子串次数
    整数
    upper()/lower()
    全大写/全小写
    新字符串
    startswith(prefix)
    是否以某串开头
    布尔
    endswith(suffix)
    是否以某串结尾
    布尔
    isdigit()
    是否只含数字
    布尔
    isalpha()
    是否只含字母
    布尔

二、元组:不可变的有序序列

   之前已经简单介绍过元组了,在此增加元组的一个重要特性:解包
  1. 元组解包(重要!)
    # 基本解包point = (34)x, y = pointprint(x, y)              # 3 4# 交换变量(不需要临时变量)a, b = 1020a, b = b, aprint(a, b)              # 20 10# 扩展解包:用 * 收集多余元素t = (12345)first, *middle, last = tprint(first)             # 1print(middle)            # [2, 3, 4]  变成列表print(last)              # 5# 函数返回多个值时经常用元组defget_name_and_age():return"小王"18# 返回的是元组name, age = get_name_and_age()print(name, age)         # 小王 18
  2. tuple()list()互相转换
    # 列表 → 元组lst = [123]t = tuple(lst)print(t)                 # (1, 2, 3)# 元组 → 列表t = (456)lst = list(t)print(lst)               # [4, 5, 6]

三、集合:无序不重复的容器

  1. 集合长什么样?
    • 用花括号{}包裹,元素用逗号分隔(和字典区分:没有冒号):
      s = {12345}print(type(s))          # <class 'set'># 空集合必须用 set(),不能用 {}empty = set()           # ✅ 空集合not_a_set = {}          # ❌ 这是空字典!print(type(empty))      # <class 'set'>print(type(not_a_set))  # <class 'dict'>
  2. 集合的核心特征
    特征
    说明
    无序
    没有索引,不能用[0] 访问
    不重复
    自动去重
    可变
    可以添加和删除元素
    元素必须不可变
    不能放列表、字典
    # 自动去重s = {122333}print(s)                  # {1, 2, 3}# 无序:每次打印顺序可能不同s = {"苹果""香蕉""橘子"}print(s)                  # 顺序不确定# 不能用索引访问# s[0]                    # TypeError: 'set' object is not subscriptable
  3. 集合的增删操作
    s = {123}# 添加元素s.add(4)print(s)                  # {1, 2, 3, 4}s.add(2)                  # 添加已有的元素,不会报错,但也不会重复print(s)                  # {1, 2, 3, 4}# 删除元素s.remove(3)               # 删除元素,不存在会报错print(s)                  # {1, 2, 4}s.discard(99)             # 删除元素,不存在不报错(更安全)# 随机删除一个元素s.pop()                   # 因为无序,所以是"随机"的# 清空s.clear()print(s)                  # set()
  4. 集合运算(最强大的功能!)
    a = {12345}b = {45678}# 交集:两个集合共有的元素print(a & b)              # {4, 5}print(a.intersection(b))  # {4, 5}# 并集:两个集合的所有元素(去重)print(a | b)              # {1, 2, 3, 4, 5, 6, 7, 8}print(a.union(b))         # {1, 2, 3, 4, 5, 6, 7, 8}# 差集:a有但b没有的print(a - b)              # {1, 2, 3}print(a.difference(b))    # {1, 2, 3}# 对称差集:只在其中一个集合中出现的print(a ^ b)              # {1, 2, 3, 6, 7, 8}print(a.symmetric_difference(b))  # {1, 2, 3, 6, 7, 8}
  5. 集合的子集和超集判断
    a = {12345}b = {23}# b 是 a 的子集吗?print(b.issubset(a))      # Trueprint(b <= a)             # True# a 是 b 的超集吗?print(a.issuperset(b))    # Trueprint(a >= b)             # True# 两个集合是否没有交集c = {678}print(a.isdisjoint(c))    # True  没有公共元素
  6. 集合的常见应用场景
    # 场景一:列表去重nums = [122333445]unique = list(set(nums))print(unique)             # [1, 2, 3, 4, 5]  顺序可能改变# 保持顺序的去重nums = [122333445]seen = set()unique_ordered = []for n in nums:if n notin seen:        seen.add(n)        unique_ordered.append(n)print(unique_ordered)     # [1, 2, 3, 4, 5]  顺序保持# 场景二:判断元素是否在大量数据中(集合查找比列表快得多)valid_ids = {10011002100310041005}  # 用集合user_id = int(input("请输入ID:"))if user_id in valid_ids:    print("有效ID")else:    print("无效ID")# 场景三:找出两个列表的共同元素class_a = {"小王""小李""小张"}class_b = {"小张""赵六""小王"}both = class_a & class_bprint("两班都有的同学:", both)   # {'小王', '小张'}

四、四种数据类型对比总结

列表list
元组tuple
集合set
字典dict
符号
[](){}{k:v}
有序
✅(3.7+)
可变
可重复
键不可重复
索引访问
按键访问
典型场景
有序数据集合
固定数据
去重/交集
键值映射
# 选择指南# 需要增删改?→ 列表shopping_cart = ["苹果""牛奶""面包"]shopping_cart.append("鸡蛋")# 数据固定不变?→ 元组PI = (3141592653589793)RGB_RED = (25500)# 需要去重/求交集?→ 集合registered_emails = set()registered_emails.add("a@qq.com")# 需要通过名字查数据?→ 字典user = {"name""小王""age"18}

⚠️ 常见坑

  1. 单元素元组必须加逗号
    t1 = (42,)       # 元组t2 = (42)        # 不是元组!就是整数42print(type(t1))  # <class 'tuple'>print(type(t2))  # <class 'int'>
  2. 空集合不能用{}
    s = {}           # 这是字典!s = set()        # ✅ 这才是空集合
  3. 集合不能放可变元素
    # s = {1, [2, 3]}    # TypeError: unhashable type: 'list's = {1, (23)}      # ✅ 元组可以
  4. set()去重会打乱顺序
    names = ["小王""小李""小王""小张""小李"]unique = list(set(names))print(unique)    # 顺序不确定!
  5. 字符串方法不改变原字符串
    s = "  hello  "s.strip()        # 返回新字符串,但 s 没变!print(s)         # "  hello  "  还是原样s = s.strip()    # ✅ 要重新赋值print(s)         # "hello"
  6. find()找不到返回-1index()找不到报错
    s = "hello"print(s.find("x"))     # -1# print(s.index("x"))   # ValueError

✍️ 实战练习

  1. 文本统计工具
    • 要求:输入一段文字,统计单词数、字符数、某个单词出现次数。
    • 示例:
      text = input("请输入一段文字:").strip()words = text.split()print(f"字符数:{len(text)}")print(f"单词数:{len(words)}")target = input("请输入要查找的单词:")print(f"'{target}' 出现了 {text.count(target)} 次")
  2. 共同好友
    • 要求:两个人的好友列表(可能有重复),找出共同好友和所有好友。
    • 示例:
      alice_friends = ["小王""小李""小张""赵六""小王"]bob_friends = ["小张""赵六""钱七""孙八"]alice_set = set(alice_friends)bob_set = set(bob_friends)common = alice_set & bob_setall_friends = alice_set | bob_setonly_alice = alice_set - bob_setprint(f"共同好友:{common}")print(f"所有好友:{all_friends}")print(f"只有Alice的好友:{only_alice}")
  3. CSV 数据解析
    • 要求:将逗号分隔的字符串拆分为列表,筛选出符合条件的记录。
    • 示例:
      # 模拟CSV数据data = "小王,92;小李,88;小张,95;赵六,48;钱七,73"records = data.split(";")result = []for record in records:    name, score_str = record.split(",")    score = int(score_str)if score >= 80:        result.append(f"{name}({score}分)")print("优秀学生:""、".join(result))# 优秀学生:小王(92分)、小李(88分)、小张(95分)

✅ 自测清单

  • [ ] 能使用split()join()replace()strip()find()等常用字符串方法
  • [ ] 知道字符串方法都返回新字符串,不会修改原字符串
  • [ ] 能区分 find()(返回 -1)和 index()(报错)的不同
  • [ ] 理解元组是不可变的有序序列,知道单元素元组必须加逗号
  • [ ] 能用元组解包一次获取多个值,如x, y = point
  • [ ] 理解集合是无序不重复的容器,能用{}set()创建
  • [ ] 能用集合进行交集&、并集|、差集-、对称差集^运算
  • [ ] 能根据场景选择合适的数据类型:列表、元组、集合、字典

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  1. CONNECT:[ UseTime:0.001013s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000907s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000354s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000234s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000586s ]
  8. SELECT * FROM `article` WHERE `id` = 495686 LIMIT 1 [ RunTime:0.001905s ]
  9. UPDATE `article` SET `lasttime` = 1783037314 WHERE `id` = 495686 [ RunTime:0.030372s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000703s ]
  11. SELECT * FROM `article` WHERE `id` < 495686 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001168s ]
  12. SELECT * FROM `article` WHERE `id` > 495686 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001114s ]
  13. SELECT * FROM `article` WHERE `id` < 495686 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001800s ]
  14. SELECT * FROM `article` WHERE `id` < 495686 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012036s ]
  15. SELECT * FROM `article` WHERE `id` < 495686 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004759s ]
0.221322s