python基礎知識筆記-集合

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  集合使用花括弧將元素之間用逗號隔開即可。集合的輸出裡不會出現相同的元素。集合中有並集、交集、差集等，以下為一些簡單的表達：

   

def main():    list1=[1,1,2,2,3,3]    print(list1)    set1={1,1,2,2,3,3}    print(set1)    set1.add(4)    set1.add(5)    print(set1)    set2={1,3,5,7,9}    print(set2)    set3=set1 & set2    #set3=set1.intersection(set2)    print(set3)    set3=set1 | set2    #st3=set1.union(set2)    print(set3)    set3=set1-set2    #set3=set1.difference(set2)    print(set3)    set3 = set2.difference(set1)    print(set3)    set3=set1 ^ set2    #set3=set1.symmetric_difference(set2)    print(set3)    for val in set2:        print(val)    print(set2.pop())    if 3 in set2:        set2.remove(3)    print(set2)    print(set2<=set1)    #print(set2.issubset(set1))    print(set1>=set2)    #print(set1.issuperset(set2))if __name__ == ‘__main__‘:    main()結果：[1, 1, 2, 2, 3, 3]{1, 2, 3}{1, 2, 3, 4, 5}{1, 3, 5, 7, 9}{1, 3, 5}{1, 2, 3, 4, 5, 7, 9}{2, 4}{9, 7}{2, 4, 7, 9}135791{5, 7, 9}FalseFalse

　　

python基礎知識筆記-集合