Count elements in a list python

Question

I need to be able to count how many of the string \"O\" is in my list

top_board = [
    [None, None, None, None, None, None, None, None, None],
    [None, None,         


        

Answer 1

Since you asked for a function:

def count_O (top_board):
    if True in ["O" in e for e in top_board]:
        print "O found"