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set函数在python中的常见用法

小樊
86
2024-09-08 22:08:17
栏目: 编程语言

在Python中,set()函数通常用于创建一个集合(set)

  1. 创建一个空集合:
empty_set = set()
  1. 使用可迭代对象(如列表、元组等)创建集合:
numbers = [1, 2, 3, 4, 5]
number_set = set(numbers)
print(number_set)  # 输出:{1, 2, 3, 4, 5}
  1. 去除列表中的重复元素:
duplicates = [1, 2, 2, 3, 4, 4, 5]
unique_elements = set(duplicates)
print(list(unique_elements))  # 输出:[1, 2, 3, 4, 5]
  1. 检查两个集合是否相等:
set1 = {1, 2, 3}
set2 = {1, 2, 3}
print(set1 == set2)  # 输出:True
  1. 检查一个集合是否为另一个集合的子集:
subset = {1, 2}
superset = {1, 2, 3, 4, 5}
print(subset.issubset(superset))  # 输出:True
  1. 检查一个集合是否包含另一个集合:
subset = {1, 2}
superset = {1, 2, 3, 4, 5}
print(superset.issuperset(subset))  # 输出:True
  1. 计算两个集合的并集:
set1 = {1, 2, 3}
set2 = {3, 4, 5}
union_set = set1.union(set2)
print(union_set)  # 输出:{1, 2, 3, 4, 5}
  1. 计算两个集合的交集:
set1 = {1, 2, 3}
set2 = {2, 3, 4}
intersection_set = set1.intersection(set2)
print(intersection_set)  # 输出:{2, 3}
  1. 计算两个集合的差集:
set1 = {1, 2, 3}
set2 = {2, 3, 4}
difference_set = set1.difference(set2)
print(difference_set)  # 输出:{1}
  1. 计算两个集合的对称差集:
set1 = {1, 2, 3}
set2 = {2, 3, 4}
symmetric_difference_set = set1.symmetric_difference(set2)
print(symmetric_difference_set)  # 输出:{1, 4}

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