p_l = ['a', 'b', 'c']
l_n = ['b', 'c', 'd']
s = set(p_l)
l = set(l_n)
print(s.intersection(l))
# intersection() 能筛选出两个集合的交集

p_l = ['a', 'b', 'c']
l_n = ['b', 'c', 'd']
s = set(p_l)
l = set(l_n)
print(s.intersection(l))# print(s&l)
print(s.union(l)) # print(s|l) 并集
# intersection() 能筛选出两个集合的交集