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小白学python第31天之元组的定义与使用

  • 2026-01-12 11:06:11
小白学python第31天之元组的定义与使用

1.7

元组的定义与使用

?

学前疑惑

前几天,我们已经学习了列表,列表(List)和元组(Tuple)都是用来存储数据集合的重要容器,那他们两者有什么关键上的区别?

1

元组的定义与使用

(1)为什么需要元组

思考:如果想要存储多个数据,但是这些数据是不能修改的数据,怎么做?

答:列表?列表可以一次性存储多个数据,但是列表中的数据允许更改。

num_list = [10,20,30]num_list[0] = 100

那这种情况下,我们想要存储多个数据且数据不允许更改,应该怎么办呢?

答:使用元组,元组可以存储多个数据且元组内的数据是不能修改的。

(2)元组的定义

第二次世界大战以后,主要参战国政府大多设立国家级哀悼日。用国家公祭的形式来祭奠死难的国民,增强战争灾难历史的记忆,成为国际惯例。

基本语法:

# 多个数据元组tuple1 = (102030)# 单个数据元组tuple2 = (10,)

注意:如果定义的元组只有一个数据,那么这个数据后面也要添加逗号,否则数据类型为唯一的这个数据的数据类型。

案例:

# 多个数据元组tuple1 = (10, 20, 30)print(tuple1)print(type(tuple1))# 单个数据元组tuple2 = (10,)print(tuple2)print(type(tuple2))# 单个数据元组没加逗号tuple3 = (10)print(tuple3)print(type(tuple3))

(3)元组的相关操作方法

由于元组中的数据不允许直接修改,所以其操作方法大部分为查询方法。

案例1:

访问元组中的某个元素。

nums = (102030)print(nums[1])  # 输出结果:20

案例2:

查找某个元素在元组中出现的位置,存在则返回索引下标,不存在则直接报错。

nums = (102030)print(nums.index(20))  # 输出结果:1print(nums.index(50))  # 不存在所以报错

案例3:

统计某个元素在元组中出现的次数。

nums = (102030411020)print(nums.count(10))  # 输出结果:2

案例4:

len()方法主要就是求数据序列的长度,字符串、列表、元组。

# 求元组的长度(里面有多少个元素)nums = (102030411020)print(len(nums))  # 输出结果:6

今日学习完毕,课后作业:

已知一个小组学生数学成绩的元组(85, 92, 78, 92, 88, 95, 92, 81),请按照以下要求进行操作:

① 获取第五个学生的成绩;

② 查找成绩92第一次出现的位置;

③ 统计92分出现了几次;

④ 统计总共有多少学生。

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  1. CONNECT:[ UseTime:0.000670s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000911s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012738s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006946s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000900s ]
  6. SELECT * FROM `set` [ RunTime:0.000232s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000615s ]
  8. SELECT * FROM `article` WHERE `id` = 460800 LIMIT 1 [ RunTime:0.000502s ]
  9. UPDATE `article` SET `lasttime` = 1770569064 WHERE `id` = 460800 [ RunTime:0.003583s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000373s ]
  11. SELECT * FROM `article` WHERE `id` < 460800 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001632s ]
  12. SELECT * FROM `article` WHERE `id` > 460800 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000491s ]
  13. SELECT * FROM `article` WHERE `id` < 460800 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005460s ]
  14. SELECT * FROM `article` WHERE `id` < 460800 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003288s ]
  15. SELECT * FROM `article` WHERE `id` < 460800 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000909s ]
0.111322s