集合关系的交集，差，并集的运算

r = ["hehe","haha","woaini"]
v = ["hehe","haha","nishishabi"]
p = set(r)
y = set(v)
print(p.intersection(y))
print(p&y)

{‘hehe‘, ‘haha‘}
{‘hehe‘, ‘haha‘}

r = ["hehe","haha","woaini"]
v = ["hehe","haha","nishishabi"]
p = set(r)
y = set(v)
print(p.union(y))
print(p|y)

{‘haha‘, ‘hehe‘, ‘woaini‘, ‘nishishabi‘}
{‘haha‘, ‘hehe‘, ‘woaini‘, ‘nishishabi‘}

r = ["hehe","haha","woaini"]
v = ["hehe","haha","nishishabi"]
p = set(r)
y = set(v)
print(p-y)
print(p.difference(y))

{‘woaini‘}
{‘woaini‘}