How to calculate the number of same elements in 2D arrays in Python?

Now I have two 2D arrays, I want to compare

['A','B','E','G', 'T'] & ['A','C','E','N','M']
['a','f','c','h','u'] & ['a','b','c','y','l']

and calculate the same elements.

aaa = [['A','B','E','G','T'],['a','f','c','h','u']]
bbb = [['A','C','E','N','M'],['a','b','c','y','l']]

So in this example, the output is 2+2

I know how to do if it's a 1D array, but don't know how to do this with 2D arrays. Many thanks.

Solution

You could use zip() builtin method to pair elements:

aaa = [['A','B','E','G','T'],['a','f','c','h','u']]
bbb = [['A','C','E','N','M'],['a','b','c','y','l']]

c = sum(ii[0] == ii[1] for i in zip(aaa, bbb) for ii in zip(*i))
print(c)

Prints:

EDIT: If you don't care about order of elements, you can use sets:

aaa = [['A','E','C','G','T'], ['a','f','c','h','u']]
bbb = [['A','C','E','N','M'], ['a','b','c','y','l']]

c = sum(len(set(i1) & set(i2)) for i1, i2 in zip(aaa, bbb))
print(c)

Prints (Common elements in first array 'A', 'E', 'C' and in second array 'a', 'c'):