Python学习笔记6-集合

print({"FishC","Python"})
print({s for s in "FishC"})
print(set("FishC"))
#{'FishC', 'Python'}
#{'F', 's', 'C', 'i', 'h'}
#{'F', 's', 'C', 'i', 'h'}
s=set("FishC")
print('C' in s)             #True
for each in s:
    print(each)             #h F s i C

输出结果是无序的

s=set([1,1,2,3,5])
print(s)
s=[1,2,2,3,5]
print(len(s)==len(set(s)))
t=frozenset('FishC')#不可变集合
print(t)

s=set("FishC")
#无交集
print(s.isdisjoint(set("Python")))	   #False
print(s.isdisjoint("JAVA"))       	   #True
#是子集
print(s.issubset("FishC.com.cn")) 	   #True
#是超集
print(s.issuperset("Fish"))            #True
#是并集
print(s.union({1,2,3},'python'))       #{1, 2, 3, 's', 't', 'y', 'p', 'i', 'F', 'h', 'C', 'n', 'o'}#
#是交集
print(s.intersection("Fish"))     	   #{'i', 'F', 's', 'h'}
#是差集
print(s.difference('Fish'))       	   #{'C'}
#（异或）对称差集（不支持多参数）
print(s.symmetric_difference('python'))#{'p', 'i', 't', 'o', 'C', 'y', 's', 'F', 'n'}

s=set("FishC")
print(s)
#update(*others)
s.update([1,1],"23")
print(s)                #{'3', 1, 'C', 's', 'F', 'h', 'i', '2'}
s.symmetric_difference_update("Python")
print(s)                #{1, 't', 'P', '2', 'o', 'y', 'i', 'F', 'C', 's', '3', 'n'}
s.difference_update("Php","Python")
print(s)                #{1, '2', 'i', 'F', 'C', 's', '3'}
s.add("45")
print(s)                #{'i', 'C', 1, 'F', 's', '3', '45', '2'}
s.discard("我")
print(s)                #{'i', 'C', 1, 'F', 's', '3', '45', '2'}
s.pop()                 #随即顺序弹出
s.clear()
print(s)                #{}