a =set([1,2,3,4,5])
b =set([4,5,6,7,8])

print(a|b)  #a與b集合的並集
{1,2,3,4,5,6,7,8}
print(a&b)  #a與b集合的交集
{4,5}
print(a^b)  #a與b的反向差集
{1,2,3,6,7,8}

tup1 = ('python','chemistry',1977,2019);
tup2 = (1,2,3,4,5,6);
tup3 
 
= "a","b","c","d";

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