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小白学python第36天之集合篇

  • 2026-02-07 10:25:43
小白学python第36天之集合篇

1.12

集合篇

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学前疑问

在第4天里,我们知道7种基本数据类型分别为:数值类型、布尔类型、字符串类型、列表、元组、字典、集合,前面我们已经学了6种,就剩下了集合。今天,让我们一起来学习一下集合。

1

集合

(1)什么是集合

集合(set)是一个无序的不重复元素序列

① 天生去重

② 无序

(2)集合的定义

在python中,我们可以使用一对花括号{}或者set()方法来定义集合,但是如果你定义的集合是一个空集合,则只能使用set()方法。

# 定义一个集合s1 = {10, 20, 30, 40, 50}print(s1)  # {50, 20, 40, 10, 30}print(type(s1))  # <class 'set'># 定义一个集合:集合中存在相同的数据s3 = {'刘备''张飞''刘备''关羽'}print(s3)  # {'张飞', '刘备', '关羽'}print(type(s3))  # <class 'set'># 定义空集合s4 = {}s5 = set()print(type(s4))  # <class 'dict'>print(type(s5))  # <class 'set'>

(3)集合操作的相关方法(增删改查)

① 集合的增操作

a、add()方法:向集合中增加一个元素(单一)

# 1、add方法增加单一数据students = set()students.add('刘备')students.add('曹操')students.add('曹操')  # 集合会自动删除重复数据print(students)

b、update()方法:向集合中增加序列类型的数据(字符串、列表、元组、字典)

# 2、update方法增加序列类型数据students = set()list1 = ['刘备''张飞''刘备''关羽']students.update(list1)print(students)

② 集合的删操作

a、remove()方法:删除集合中的指定数据,如果数据不存在则报错

b、discard()方法:删除集合中的指定数据,如果数据不存在也不会报错。

c、pop()方法:随机删除集合中的某个数据,并返回这个数据

# 1、定义一个集合products = {'刘备''张飞''曹操''关羽'}# 2、使用remove方法删除刘备这个元素products.remove('刘备')print(products)# 3、使用discard方法删除未知元素products.discard('诸葛亮')print(products)# 4、使用pop方法随机删除某个元素del_product = products.pop()print(f'随机删除的元素为:{del_product}')print(products)

③ 集合的查操作

a、in:判断某个元素是否在集合中,如果在,则返回Ture,否则返回False

b、not in:判断某个元素不在集合中,如果不在,则返回True,否则返回False

# 定义一个set集合s1 = {'刘备''张飞''曹操''关羽'}# 判断刘备是否在s1集合中if'刘备' in s1:    print('刘备在s1集合中')else:    print('刘备没有出现在s1集合中')

c、集合的遍历操作

s1= {'刘备''张飞''曹操''关羽'}for i in s1:    print(i)

④ 集合的改操作

集合(set)本身是可变但无序的,但其元素必须是不可变(可哈希)类型。这意味着你不能直接修改集合中某个已存在的元素,但可以通过一些操作来间接实现类似“修改”的效果。

下面这个表格总结了主要的“修改”操作和方法。

2

集合中的交集、并集与差集特性

(1)在python中,我们可以使用 & 来球两个集合的交集:

(2)在python中,我们可以使用 | 来求两个集合的并集:

(3)在python中,我们可以使用 - 来求两个集合的差集:

(4)案例

# 求集合中的交集、并集、差集s1 = {'刘备''关羽''张飞''貂蝉'}s2 = {'袁绍''董卓''吕布''貂蝉'}# 求两个集合中的交集print(s1 & s2)# 求两个集合中的并集print(s1 | s2)# 求两个集合中的差集print(s1 - s2)print(s2 - s1)

今日学习完毕,课后作业:

已知两个小组成员:

小组a成员有:"张三"、"李四"、"王五"、"赵六"、"王五"、"钱七",

小组b成员有:"赵六"、"钱七"、"孙八"、"周九"、"孙八"。

请按照以下要求进行操作:

① 求小组a的独特成员;

② 求小组b的独特成员;

③ 求两个小组的共同成员;

④ 求所有不重复的成员。

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  1. CONNECT:[ UseTime:0.000598s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000772s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000317s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000624s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000598s ]
  8. SELECT * FROM `article` WHERE `id` = 462861 LIMIT 1 [ RunTime:0.000670s ]
  9. UPDATE `article` SET `lasttime` = 1770550627 WHERE `id` = 462861 [ RunTime:0.002077s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.008654s ]
  11. SELECT * FROM `article` WHERE `id` < 462861 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001080s ]
  12. SELECT * FROM `article` WHERE `id` > 462861 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001559s ]
  13. SELECT * FROM `article` WHERE `id` < 462861 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003091s ]
  14. SELECT * FROM `article` WHERE `id` < 462861 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001077s ]
  15. SELECT * FROM `article` WHERE `id` < 462861 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002028s ]
0.094702s