import copy

def ct4(L, A, n): 
    A[0][0] += n 
    A[1] += [10*n] 
    L.append(n)



def findVs(L):
    rows = len(L)
    cols = len(L[0])
    for row in range(rows):
        for col in range(cols):
            if (L[row][col] == 1 and L[row+1][col+1]==1 and (L[row][col+2])==1):
                return (row, col)

def testZeroRectCount():
    print('testing findVs...')
    L = [[0, 0, 0, 0],
         [1, 0, 1, 0], 
         [0, 1, 0 ,0],
         [0, 0, 0, 0]]
    assert(findVs(L) == (1, 0))
    print('Passed!')

def main():
    print('------------------------------------------------------------')
    testZeroRectCount()
    # Be careful to get the brackets and commas right! 
        

    L = [[1], [2]]
    C = copy.copy(L)
    D = copy.deepcopy(L) 
    ct4(L, C, 1)
    ct4(L, D, 2) 
    print(L)

    
main()