Python 集合(set)及其操作

'''myset={1,2,3,4,5,6}   #数据不会重复，没下标，没次序myset.add(8) #插入数据myset.add(1) #去重print(myset)myset=set("abcdefg")myset.update("abcdxyz")#update把不重复的字符添加到set中print(myset)'''myset={1,2,3,4,5,6}myset.update([1,2,8,9]) #单个整数不可以,list,tuple,字符串可以用updateprint(myset)###### 删除元素myset.remove(5)    #删除元素，和discard相同，只是删除不存在的元素会出错myset.discard(14)  #删除元素，myset.pop()        #删除第一个元素myset.clear()      #清空setdel myset          #完全删除myset.copy()    #深复制(改变新的set，并不会改变原来的set)。变量赋值是浅复制，改变一个会同时改变另一个set######## 遍历setmyset={1,2,3,4,5,6}for i  in myset: #遍历集合，副本(i)修改并不会修改原来的set    print(i)#print(myset[0])#set没有索引for  idx,iddata in enumerate(myset): #enumerate生成索引    print(idx,iddata)   #idx下标，iddata元素####### set无法修改，修改可以先转换成List#######  set1.difference(set2)  #差集，和set1-set2相同####### set运算符set1={1,2,3,4,5}set2={1,2,7,8,9}set3={1,2,3,4,5}set4={1,2,3,4,5,6}'''print( 1  in  set3) #仅仅用于单个元素，不用于集合之间关系print( 10  not  in  set3)print(set1-set2) #set1有，set2没有print(set2-set1) #set2有，set1没有print(set1 & set2) #set1,set2共有print(set1 | set2) #包含set1,set2,没有重复print(set1 ^ set2)#并集-交集-，特色文化遗产print(set1 == set3)  #==,!=相等'''####### 关系运算符myset1={1,2,3,4}myset2={1,2,3,4,5}myset3={1,10,11,12,13,16,18}print(myset1>myset2)print(myset1<myset2)print(myset3>=myset2)print(myset3<=myset2)#print(5>=5)#print(myset2>myset1) #   myset2>myset1，myset2包含myset1所有元素#print(myset1<myset2) #myset1是否被myset2包含#  myset2==  myset1  myset2!=  myset1 判断是否完全相等#myset1 <myset2  myset1是否被myset2包含     myset1<=myset2      myset1是否被myset2包含 或者相等#myset1>myset2  myset1>=myset2 myset1是否包含 myset2myset1  是否被myset2包含 或者相等######### 子集与父集myset1={1,2,3,4}myset2={1,2,3,4,5}print(len(myset1))#求长度print(myset1.issuperset(myset2)) #(父集)myset1是否包含myset2print(myset1.issubset(myset2))   #(子集)myset1是否被myset2包含print(myset2.issuperset(myset1)) print(myset2.issubset(myset1))######### 不可变set，不可以修改增加删除fz=frozenset([1,2,3,4,5])print(fz)print(type(fz))