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从零开始学python-集合

  • 2026-02-06 21:51:55
从零开始学python-集合

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前言:

   主要分享的是Python版本为Python3的内容。

1、什么是集合?

集合是Python中的一种无序、可变、不重复元素的容器类型。它基于数学中的集合概念实现,常用于去重、成员测试和数学运算。

✅ 可变性:可以添加或删除元素

✅ 自动去重:重复元素仅保留一份

✅ 元素要求:必须为可哈希类型(不可变:数字、字符串、元组等)

✅ 无序性:元素没有固定顺序

❌ 不支持:索引访问、切片、包含可变对象(列表/字典/集合)

2. 创建集合

语法1:使用花括号

①. 创建空集合(注意:不能用{}创建空集合,{}创建的是字典)empty_set = set()②. 创建有元素的集合fruits = {"apple""banana""cherry"}numbers = {12345}print(fruits)  # 输出:{'banana''apple''cherry'}(顺序可能不同)print(type(fruits))  # 输出:<class 'set'>

语法2:使用set()构造函数

①. 从列表创建集合list_to_set = set([1, 2, 2, 3, 3, 4])print(list_to_set)  # 输出:{1, 2, 3, 4}(自动去重)②. 从元组创建集合tuple_to_set = set((12321))print(tuple_to_set)  # 输出:{1, 2, 3}③. 从字符串创建集合(每个字符作为元素)string_to_set = set("hello")print(string_to_set)  # 输出:{'e', 'h', 'l', 'o'}

语法3:集合推导式

①. 创建平方数的集合squares = {x**2 for x in range(10)}print(squares)  # 输出:{0, 1, 4, 9, 16, 25, 36, 49, 64, 81}②. 带条件的集合推导式even_squares = {x**2 for x in range(10if x % 2 == 0}print(even_squares)  # 输出:{0, 4, 16, 36, 64}

注意:集合元素必须是可哈希的

①. 正确的:使用不可变类型valid_set = {12.5"hello", (123)}print(valid_set)  # 输出正常②. 错误的:尝试使用可变类型try:    invalid_set = {[12], [34]}  # 列表是可变的,不可哈希except TypeError as e:    print(f"错误: {e}")  # 输出:错误: unhashable type: 'list'

3. 集合基本操作

添加元素

# 语法:set.add(element)fruits = {"apple""banana"}fruits.add("orange")print(fruits)  # 输出:{'banana''orange''apple'}# 添加已存在的元素不会有变化fruits.add("apple")print(fruits)  # 输出:{'banana''orange''apple'}(不变)

更新集合(添加多个元素)

# 语法:set.update(iterable)fruits = {"apple""banana"}fruits.update(["orange""grape""apple"])print(fruits)  # 输出:{'grape''banana''orange''apple'}可以使用任何可迭代对象:fruits.update(("kiwi""mango"))print(fruits)  # 输出包含新增水果

删除元素

①. 语法1set.remove(element) - 元素必须存在fruits = {"apple""banana""cherry"}fruits.remove("banana")print(fruits)  # 输出:{'cherry', 'apple'}try:    fruits.remove("orange")  # 不存在会报错except KeyError as e:    print(f"KeyError: {e}")  # 输出:KeyError: 'orange'②. 语法2set.discard(element) - 元素不存在不会报错fruits.discard("apple")fruits.discard("watermelon")  # 不会报错print(fruits)  # 输出:{'cherry'}③. 语法3set.pop() - 随机删除并返回一个元素fruits = {"apple""banana""cherry"}removed_item = fruits.pop()print(f"删除了: {removed_item}, 剩余: {fruits}")④. 语法4set.clear() - 清空集合fruits.clear()print(fruits)  # 输出:set()

查询操作

检查元素是否存在:fruits = {"apple""banana""cherry"}print("apple" in fruits)  # 输出:Trueprint("orange" not in fruits)  # 输出:True获取集合长度:print(len(fruits))  # 输出:3

4. 集合运算

并集(Union)

语法1:set1.union(set2) 或 set1 | set2A = {1, 2, 3}B = {3, 4, 5}①. 方法1:使用union()方法union_set = A.union(B)print(union_set)  # 输出:{1, 2, 3, 4, 5}②. 方法2:使用|运算符union_set = A | Bprint(union_set)  # 输出:{1, 2, 3, 4, 5}③. 多个集合的并集C = {5, 6, 7}multi_union = A.union(B, C)print(multi_union)  # 输出:{1, 2, 3, 4, 5, 6, 7}

交集(Intersection)

语法:set1.intersection(set2) 或 set1 & set2A = {1, 2, 3, 4}B = {3, 4, 5, 6}①. 方法1:使用intersection()方法intersection_set = A.intersection(B)print(intersection_set)  # 输出:{3, 4}②. 方法2:使用&运算符intersection_set = A & Bprint(intersection_set)  # 输出:{3, 4}③. 多个集合的交集C = {4, 5, 6}multi_intersection = A.intersection(B, C)print(multi_intersection)  # 输出:{4}

差集(Difference)

语法:set1.difference(set2) 或 set1 - set2A = {1, 2, 3, 4, 5}B = {4, 5, 6, 7}①. 方法1:使用difference()方法difference_set = A.difference(B)print(difference_set)  # 输出:{1, 2, 3}②. 方法2:使用-运算符difference_set = A - Bprint(difference_set)  # 输出:{1, 2, 3}③. 注意:差集运算顺序很重要difference_set = B - Aprint(difference_set)  # 输出:{6, 7}

对称差集(Symmetric Difference)

语法:set1.symmetric_difference(set2) 或 set1 ^ set2A = {1, 2, 3, 4}B = {3, 4, 5, 6}①. 方法1:使用symmetric_difference()方法sym_diff_set = A.symmetric_difference(B)print(sym_diff_set)  # 输出:{1, 2, 5, 6}②. 方法2:使用^运算符sym_diff_set = A ^ Bprint(sym_diff_set)  # 输出:{1, 2, 5, 6}

集合关系判断

①. 子集判断A = {1, 2, 3}B = {1, 2, 3, 4, 5}语法:set1.issubset(set2) 或 set1 <= set2print(A.issubset(B))  # 输出:Trueprint(A <= B)  # 输出:True②. 真子集判断:set1 < set2print(A < B)  # 输出:True(A是B的真子集)print(A < A)  # 输出:False(集合不是自身的真子集)③. 超集判断语法:set1.issuperset(set2) 或 set1 >= set2print(B.issuperset(A))  # 输出:Trueprint(B >= A)  # 输出:True④. 真超集判断:set1 > set2print(B > A)  # 输出:True⑤. 相交判断C = {6, 7, 8}print(A.isdisjoint(C))  # 输出:Trueprint(A.isdisjoint(B))  # 输出:False(有交集)

5. 集合的常用方法

复制集合

语法:set.copy()original = {123}copy_set = original.copy()copy_set.add(4)print(original)  # 输出:{1, 2, 3}print(copy_set)  # 输出:{1, 2, 3, 4}

修改原集合的方法

①. 更新原集合为并集A = {1, 2, 3}B = {3, 4, 5}A.update(B)  # 相当于 A |= Bprint(A)  # 输出:{1, 2, 3, 4, 5}②. 更新原集合为交集A = {1, 2, 3, 4}B = {3, 4, 5}A.intersection_update(B)  # 相当于 A &= Bprint(A)  # 输出:{3, 4}③. 更新原集合为差集A = {1, 2, 3, 4}B = {3, 4, 5}A.difference_update(B)  # 相当于 A -= Bprint(A)  # 输出:{1, 2}④. 更新原集合为对称差集A = {1, 2, 3, 4}B = {3, 4, 5}A.symmetric_difference_update(B)  # 相当于 A ^= Bprint(A)  # 输出:{1, 2, 5}

冻结集合(frozenset)

①. frozenset是不可变集合frozen = frozenset([12321])print(frozen)  # 输出:frozenset({1, 2, 3})print(type(frozen))  # 输出:<class 'frozenset'>②. frozenset可以用作字典的键或另一个集合的元素dict_with_frozenset = {frozenset([12]): "value1"frozenset([34]): "value2"}print(dict_with_frozenset)  # 输出:{frozenset({1, 2}): 'value1', frozenset({3, 4}): 'value2'}set_of_frozensets = {frozenset([12]), frozenset([34])}print(set_of_frozensets)  # 输出:{frozenset({3, 4}), frozenset({1, 2})}

6. 集合的应用示例

示例1:数据去重

①. 从列表中去除重复项numbers = [1223334444]unique_numbers = list(set(numbers))print(unique_numbers)  # 输出:[1, 2, 3, 4](顺序可能不同)②. 保持原始顺序的去重方法(Python 3.7+)from collections import OrderedDictnumbers = [3122314]unique_ordered = list(OrderedDict.fromkeys(numbers))print(unique_ordered)  # 输出:[3, 1, 2, 4]

示例2:查找共同元素

找出两个列表的共同元素:list1 = [1, 2, 3, 4, 5]list2 = [4, 5, 6, 7, 8]common = set(list1) & set(list2)print(common)  # 输出:{4, 5}

7、高频陷阱与避坑指南

❌ 陷阱1:空集合误写为 {}

s = {}print(type(s))  # <class 'dict'> → 逻辑错误根源!

✅ 正确做法:s = set()

 陷阱2:包含不可哈希元素

set([ [1,2], 3 ])  # TypeError: unhashable type: 'list'

✅ 正确做法:用元组替代

valid = { (1,2), 3 }  # {(1, 2), 3}

❌ 陷阱3:依赖集合顺序

s = {312}# print(s[0])  # TypeError: 'set' object is not subscriptable

✅ 正确做法:需顺序时转为列表+排序

sorted_list = sorted(s)  # [1, 2, 3]

❌ 陷阱4:浮点数精度问题

s = {0.1 + 0.20.3}print(len(s))  # 输出:2(因0.1+0.2=0.30000000000000004 ≠ 0.3

✅ 建议:避免浮点数精确比较,或使用decimal模块

8、使用场景:

  • 去除重复元素

  • 快速成员测试

  • 数学集合运算(并集、交集、差集等)

  • 需要唯一元素的场景

9、总结

特性
说明
创建空集
永远用 set(),杜绝 {}
元素要求
仅限可哈希类型(数字/字符串/元组),禁止列表/字典/集合
顺序处理
需要顺序时:sorted(set_obj)
运算选择
操作非set对象 → 用 .union() 等方法;双方均为set → 用运算符更简洁
性能优势
大量数据去重、成员检测场景,性能远超列表
不可变需求
需作为字典键/嵌套集合 → 用 frozenset

【微语】心宽了,路就宽了。

网虫root

期待你的

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  1. CONNECT:[ UseTime:0.000627s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000760s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007309s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000344s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000628s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000595s ]
  8. SELECT * FROM `article` WHERE `id` = 473998 LIMIT 1 [ RunTime:0.008576s ]
  9. UPDATE `article` SET `lasttime` = 1770437972 WHERE `id` = 473998 [ RunTime:0.006443s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000427s ]
  11. SELECT * FROM `article` WHERE `id` < 473998 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000430s ]
  12. SELECT * FROM `article` WHERE `id` > 473998 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000492s ]
  13. SELECT * FROM `article` WHERE `id` < 473998 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000624s ]
  14. SELECT * FROM `article` WHERE `id` < 473998 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000711s ]
  15. SELECT * FROM `article` WHERE `id` < 473998 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.039090s ]
0.143004s