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Python基础笔记7——列表,像前端数组

  • 2026-07-01 06:25:25
Python基础笔记7——列表,像前端数组

📦 一、什么是数据容器?

数据容器是一种能存放多个数据的数据类型。

数据容器可以更高效地管理成批的数据,且便于存储、访问

  1. 列表(List):像购物车,东西可以随便换

  2. 元组(Tuple):像密封袋,东西不能改

  3. 集合(Set):像抽奖箱,东西不重复且无序

  4. 字典(Dict):像通讯录,有名字有电话

5. 字符串(Str)

今天重点讲列表——最常用、最好用的容器!


🛒 二、列表的定义

# 空列表empty_list = []empty_list = list()# 有数据的列表numbers = [12345]fruits = ["苹果""香蕉""橙子"]mixed = [1"hello"3.14True]  # 列表可以混装不同类型!

列表的特点:

✅ 可以存多个数据✅ 数据可以是不同类型✅ 可以修改(增删改查都支持)✅ 有顺序(每个元素都有编号)

就像一个可扩容的购物车,想装什么装什么!


🔢 三、下标(索引值)

fruits = ["苹果""香蕉""橙子""葡萄"]# 正向下标(从0开始!)print(fruits[0])  # 苹果print(fruits[1])  # 香蕉# 反向下标(从-1开始!)print(fruits[-1])  # 葡萄print(fruits[-2])  # 橙子

✏️ 四、列表的增删改查(重头戏!)

1. 增加元素

fruits = ["苹果""香蕉"]1. append():在末尾添加一个fruits.append("橙子")print(fruits)  # ['苹果''香蕉''橙子']2. insert():在指定位置插入fruits.insert(1"葡萄")print(fruits)  # ['苹果''葡萄''香蕉''橙子']3. extend():把另一个列表的元素加进来more_fruits = ["西瓜""芒果"]fruits.extend(more_fruits)print(fruits)  # ['苹果''葡萄''香蕉''橙子''西瓜''芒果']

2. 删除元素

fruits = ["苹果""香蕉""橙子""葡萄"]# del:按下标删除del fruits[1]print(fruits)  # ['苹果', '橙子', '葡萄']# pop():按下标删除并返回被删元素deleted = fruits.pop(0)print(deleted)  # 苹果print(fruits)    # ['橙子', '葡萄']# remove():按值删除(只删第一个匹配的)fruits = ["苹果""香蕉""苹果"]fruits.remove("苹果")print(fruits)  # ['香蕉', '苹果']# clear():清空列表fruits.clear()print(fruits)  # []

3. 修改元素

fruits = ["苹果""香蕉""橙子"]# 直接通过下标修改fruits[1] = "葡萄"print(fruits)  # ['苹果''葡萄''橙子']

4. 查询元素

fruits = ["苹果""香蕉""橙子""香蕉"]# index():查找元素的下标(只找第一个)print(fruits.index("香蕉"))  # 1,只查找第一层元素,如果没有找到元素直接报错# count():统计元素出现的次数print(fruits.count("香蕉"))  # 2,只查找第一层元素# in:判断元素是否在列表中print("苹果" in fruits)   # Trueprint("西瓜" in fruits)   # False

🛠️ 五、列表的常用方法

1. 排序

numbers = [31415926]# sort():原地排序(从小到大)numbers.sort()print(numbers)  # [1, 1, 2, 3, 4, 5, 6, 9]# 从大到小排序numbers.sort(reverse=True)print(numbers)  # [9, 6, 5, 4, 3, 2, 1, 1]# reverse():反转列表numbers = [12345]numbers.reverse() # 只反转第一层元素print(numbers)  # [5, 4, 3, 2, 1]

2. 复制

# copy():复制列表original = [1, 2, 3]copy_list = original.copy()copy_list[0] = 999print(original)   # [1, 2, 3](原列表没变)print(copy_list)  # [999, 2, 3]

📊 六、列表的常用内置函数

前边讲的方法都可以理解为列表的方法(属性),下边是python内置函数

numbers = [1030204050]# len():获取长度print(len(numbers))  # 5# max():最大值print(max(numbers))  # 50# min():最小值print(min(numbers))  # 10# sum():求和, 只能是数值类型print(sum(numbers))  # 150# sorted(数据容器,reverse=布尔值)# 对容器排序(从小到大,不会改变原容器)reverse 用于控制排序方式result = sorted(numbers)print(numbers) # [10, 30, 20, 40, 50]# list():转换成列表s = "hello"print(list(s))  # ['h', 'e', 'l', 'l', 'o']

🔄 七、列表的循环遍历

1. for循环遍历

fruits = ["苹果""香蕉""橙子"]# 直接遍历元素for fruit in fruits:    print(fruit)# 输出:# 苹果# 香蕉# 橙子

2. while循环遍历

fruits = ["苹果""香蕉""橙子"]index = 0while index < len(fruits):    print(fruits[index])    index += 1

3. 带下标的遍历

fruits = ["苹果""香蕉""橙子"]# start 可选参数,可以让计数从指定值开始(改变的是循环时的“编号”,不是真正的索引值)for index, fruit in enumerate(fruits , start = 2):    print(f"第{index}个:{fruit}")print(fruits[0])# 输出:# 第2个:苹果# 第3个:香蕉# 第4个:橙子# 苹果

🎮 八、实战小练习

练习1:求平均分

scores = [8592789088]# 计算平均分average = sum(scores) / len(scores)print(f"平均分:{average}")

练习2:找最大值和最小值

numbers = [31415926]max_num = max(numbers)min_num = min(numbers)print(f"最大值:{max_num}")print(f"最小值:{min_num}")

练习3:去重

# 方法1:用集合(但会打乱顺序)nums = [1, 2, 3, 2, 1, 4, 5]unique_nums = list(set(nums))print(unique_nums)  # [1, 2, 3, 4, 5](顺序可能变)# 方法2:手动去重(保持顺序)result = []for num in nums:    if num not in result:        result.append(num)print(result)  # [1, 2, 3, 4, 5]

🎯 实战大练习:学生成绩管理系统

# 初始化成绩列表scores = [8592789088]print("=== 学生成绩管理系统 ===")while True:    print("\n1. 添加成绩")    print("2. 删除成绩")    print("3. 修改成绩")    print("4. 查看所有成绩")    print("5. 统计成绩")    print("6. 退出")    choice = input("请选择操作(1-6):")    if choice == "1":        score = int(input("请输入成绩:"))        scores.append(score)        print("添加成功!")    elif choice == "2":        index = int(input("请输入要删除的下标:"))        if 0 <= index < len(scores):            deleted = scores.pop(index)            print(f"已删除成绩:{deleted}")        else:            print("下标无效!")    elif choice == "3":        index = int(input("请输入要修改的下标:"))        if 0 <= index < len(scores):            new_score = int(input("请输入新成绩:"))            scores[index] = new_score            print("修改成功!")        else:            print("下标无效!")    elif choice == "4":        print("所有成绩:")        for i, score in enumerate(scores):            print(f"第{i}个:{score}")    elif choice == "5":        print(f"最高分:{max(scores)}")        print(f"最低分:{min(scores)}")        print(f"平均分:{sum(scores)/len(scores) :.1f}")    elif choice == "6":        print("退出系统!")        break    else:        print("无效选择,请重新输入!")

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  1. CONNECT:[ UseTime:0.000639s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000643s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002886s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009447s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000733s ]
  6. SELECT * FROM `set` [ RunTime:0.006476s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000718s ]
  8. SELECT * FROM `article` WHERE `id` = 494358 LIMIT 1 [ RunTime:0.021170s ]
  9. UPDATE `article` SET `lasttime` = 1783067746 WHERE `id` = 494358 [ RunTime:0.012912s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011220s ]
  11. SELECT * FROM `article` WHERE `id` < 494358 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.027143s ]
  12. SELECT * FROM `article` WHERE `id` > 494358 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015188s ]
  13. SELECT * FROM `article` WHERE `id` < 494358 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.025741s ]
  14. SELECT * FROM `article` WHERE `id` < 494358 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.067415s ]
  15. SELECT * FROM `article` WHERE `id` < 494358 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.038388s ]
0.314244s