Python set()函数的高级技巧

1. 使用set()函数来去除重复元素

lst = [1, 2, 2, 3, 4, 4, 5] unique_set = set(lst) print(unique_set) 

输出结果:

{1, 2, 3, 4, 5} 

2. 使用集合运算符进行交集、并集和差集操作

set1 = {1, 2, 3, 4, 5} set2 = {4, 5, 6, 7, 8}  # 交集 intersection = set1 & set2 print(intersection)  # 并集 union = set1 | set2 print(union)  # 差集 difference = set1 - set2 print(difference) 

输出结果:

{4, 5} {1, 2, 3, 4, 5, 6, 7, 8} {1, 2, 3} 

3. 使用set()函数来快速创建集合

s = set([1, 2, 3, 4, 5]) print(s) 

输出结果:

{1, 2, 3, 4, 5} 

4. 使用set()函数来检查两个集合是否相等

set1 = {1, 2, 3} set2 = {3, 2, 1}  if set1 == set2:     print("The sets are equal") else:     print("The sets are not equal") 

输出结果:

The sets are equal 

5. 使用set()函数来检查一个集合是否是另一个集合的子集或超集

set1 = {1, 2, 3} set2 = {1, 2, 3, 4, 5}  if set1.issubset(set2):     print("set1 is a subset of set2")  if set2.issuperset(set1):     print("set2 is a superset of set1") 

输出结果:

set1 is a subset of set2 set2 is a superset of set1