Python集合

Python有個數學常用的型態 集合(set)

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

b.issubset(a) 會回傳True

也可以這樣用
a = set(['apple','google','microsoft'])
b = set(['apple','object C'])

b.issubset(a) 會回傳 False
b = set(['apple','google'])
b.issubset(a) 會回傳True