BASIC to python3: using lists like arrays

[Yoriz]

my_array = [[0 for y in range(20)] for x in range(10)] #dim myArray(10,20)

for x in range(10): #for x=1 to 10
   for y in range(20): #for y=1 to 20
       my_array[x][y] = (x+1)-(y+1) #let myArray(x,y)=(x-y) 'populate array with data using a formula
# next y
# next x

for x in range(10): #for x=1 to 10
   for y in range(20): #for y=1 to 20
       print(my_array[x][y])# print myArray(x,y) 'output contents - could also be print to file
# next y
# next x

Click to view output

Output:
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10

The creation and setting of values of my_array can be done in the list comprehension

my_array2 = [[(x+1)-(y+1) for y in range(20)] for x in range(10)]

print(my_array == my_array2)

Output:
True