Driver code
if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT maze = [ [ 0 , 0 , 0 , 0 ] , [ 0 , - 1 , 0 , 0 ] , [ - 1 , 0 , 0 , 0 ] , [ 0 , 0 , 0 , 0 ] ] NEW_LINE print ( countPaths ( maze ) ) NEW_LINE DEDENT