Question

Python HELP

How can a get the diagonals of an n x n list without using numpy.

For example if have a list: L = [[1,2,3,4], [5,6,7,8], [9,10,11,12], [13,14,15,16]

1	2	3	4
5	6	7	8
9	10	11	12
13	14	15	16

Then I can get the diagonals:

1, 6, 11, 16

2, 7 , 12

3, 8

5 , 10 ,15

9, 14

2, 5

3, 6, 9

4, 7, 10, 13

8, 11, 14

12, 15

Answer 1

col data = [ 18 Python 3.6.1 (default, Dec 2015, 13:05:11) [GCC 4.8.2] on linux [1, 6, 11, 16] [2, 7, 12] [3, 8] 19 while row < size and col < size: data.append(L[row] [col]) 20 21 row 1 |[5, 10, 15] col 1 22 print (data) 23 [2, 51 24 [3, 6, 9] [4, 7, 10, 13] [8, 11, 14] [12, 15] 25 for i in range (1, size): 26 row 0 27 col= i 28 data [ 29 while row < size and col > 0: 3е data.append(L[row] [ col ] ) row 1 31 32 col 33 print (data) 34 35 36 for i in range (1, size - 1): 37 row i 38 39 col size-1 data L 46 while row < size and col = 0: 41 data.append(L[row] [col]) 42 row +1 43 44 col 1 print (data) 45

L = [[1,2,3,4], [5,6,7,8], [9,10,11,12], [13,14,15,16]]

size = len(L)

for i in range(size - 1):
        row = 0
        col = i
        data = []
        while row < size and col < size:
                data.append(L[row][col])
                row += 1
                col += 1
        print(data)

for i in range(1, size - 1):
        row = i
        col = 0
        data = []
        while row < size and col < size:
                data.append(L[row][col])
                row += 1
                col += 1
        print(data)


for i in range(1, size):
        row = 0
        col = i
        data = []
        while row < size and col >= 0:
                data.append(L[row][col])
                row += 1
                col -= 1
        print(data)


for i in range(1, size - 1):
        row = i
        col = size-1
        data = []
        while row < size and col >= 0:
                data.append(L[row][col])
                row += 1
                col -= 1
        print(data)

Please upvote, as i have given the exact answer as asked in question. Still in case of any issues in code, let me know in comments. Thanks!