python第七课

╰半橙微兮° 2023-06-03 04:50 38阅读 0赞

#str int
    #str
    # s=''
    # print(s.isspace())
    #list:
    # lis=[11,22,33,44,55]
    # for i in range(len(lis)):
    #     print(i)
    #     del lis[i]
    #     print(lis)
    dic={'k1':'v1','k2':'v2','a3':'v3'}
    dic1={}
    # for i in dic:
    #     if 'k' not in i:
    #         dic1.setdefault(i,dic[i])
    # dic=dic1
    # print(dic)
    # l=[]
    # for i in dic:
    #     if 'k' in i:
    #         l.append(i)
    # for i in l:
    #     del dic[i]
    # print(dic)
    #转化成boo值
    #0 '' [] () {} set()
    #元祖 如果元祖里面只有一个元素且不加,那此元素是什么类型就是什么类型.
    # tu1=(1)
    # tu2=(1,)
    # print(tu1,type(tu1))
    # print(tu2,type(tu2))
    # tu1=([1])
    # tu2=([1],)
    # print(tu1,type(tu1))
    # print(tu2,type(tu2))
    
    #集合:可变的数据类型,他里面的元素必须是不可变的数据类型,无序,不重复,
    # set1=set({1,2,3})
    # set2={1,2,3,[2,3],{'name':'alex'}} #错的
    # print(set1)
    # print(set2)
    set1={'alex','wusir','ritian','egon','barry'}
    #add
    #set1.add('女神')
    # print(set1)
    #update
    # set1.update('abc')
    # print(set1)
    #删除
    # set1.pop()#随机删除
    # print(set1.pop())#有返回值
    # print(set1)
    # set1.remove('alex')#按元素删除
    # print(set1)
    
    #{}_set()清空集合
    # set1.clear()
    # print(set1)#set
    
    # del set1
    # # print(set1)
    # for i in set1:
    #     print(i)
    #交集和并集,反交集
    # set1={1,2,3,4,5}
    # set2={4,5,6,7,8}
    # print(set1&set2)#交集 {4,5}
    # print(set1.intersection(set2))#交集{4,5}
    # print(set1|set2)#并集12345678
    # print(set2.union(set1))#并集12345678
    # print(set1-set2)#差集{123}
    # print(set1.difference(set2))#差集123}
    #子集与超集
    # set1={1,2,3}
    # set2={1,2,3,4,5,6}
    # print(set2 > set1)
    # print(set2.issuperset(set1))#这两个相同,都是说明set2是set1超集
    # print(set1<set2)
    # print(set1.issubset(set2))#这两个相同,都是说明set1是set2子集
    #去重
    # li=[1,2,33,33,2,1,4,5,6,6]
    # set1=set(li)
    # # print(set1)
    # li=list(set1)
    # print(li)
    # s1={1,2,3}
    # print(s1,type(s1))
    s=frozenset('barry')
    print(s,type(s))
    for i in s:
        print(i)

转载于:https://www.cnblogs.com/huangjianfeng/p/11220488.html