Как найти совпадения в списках?

Question

Есть 2 списка:
A=['x' , 1 , 'e']
S=['spam' , '1' , 'w']
Как выяснить, есть ли совпадения и как их посчитать?

Answer 1

A=['x' , '1', 'e', 'solo']
S=['spam', 'solo', '1' , 'w']

# needs to convert list to set because this intersection(&) is set operation
A=set(A)
S=set(S)

'''
Suppose,
A = {1,2,7,5,9}
B = {2,4,9}

print(A & B) => output {2,9} elements present both in the set A and set B.

& means intersection
'''
res = A & S

print(res)
print('Length', len(res))

Answer 2

Спасибо

Answer 3

А что, если нужно найти совпадения в 1 списке:
A=['A' , '1' , 'w' , 'z' , '1']
Как поступить в таком случае?

Answer 4

A=['A', '1', 'w', 'z', '1']

d = {a:0 for a in A}

for a in A:
if a in d:
d[a] += 1

print(d)

Answer 5

Hm......

Answer 6

That's not exactly what I meant. This method is not suitable for further work

Answer 7

I do not deny its correctness.

Answer 8

Suppose there is a task:
In the basket there are pieces of paper with inscriptions: Kolya, Petya, Dima, Sasha
There is a list of names:Sasha, John, Alexey, Pavel.
Write a program that calculates how many boys can get a piece of paper with their name on it.