集合關系的交集，差，并集的運算

1.交集

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'}      

用intersection或者&都可以

2.并集

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'}      

用union或者|都可以

3.差集

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

{'woaini'}
{'woaini'}      

用difference或者-都可以

轉載于:https://www.cnblogs.com/newt/p/8986715.html