import sys

admins = {'Justin', 'caterpillar'}

users = {'momor', 'hamini', 'Justin'}

print('Justin' in admins)#判斷元素是否存在

print(admins & users)#聯集

print(admins | users)#交集

print(admins - users)#用第一個為基礎留下不相同的內容

print(admins ^ users)#XOR

print(admins > users)

print(admins < users)

family = set()#宣告空聯集
family.add('Justin')
family.add('Momor')
family.add('Hamimi')
print(family)