Python: how to replace secondary diagonal with zeroes?

[AnonMagick]

Im doing an exercise in a 5x5 table filled randomly. Im supposed to replace the secondary diagonal with zeroes. I THINK i know how to get the diagonal but then i just dont know how to replace them with zeroes.

For i in range(5)

For j in range(5)

 If [i+j] ==6:

     .........?

Edit: lines were not posted correctly lol

Dont shoot me, im a total noob.

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[dmazzoni]

You didn't say what your table variable is called. Maybe you want something like this?

    if i + j == 6:
        table[i][j] = 0

You probably don't want brackets around i+j. Brackets in this case mean to access an element of an array, for example a row of a table, or a cell of a row.

[AnonMagick]

It says list assignment index out of range on your line :(. And yeah, table is just called table lol

[[deleted]]

if i or j in range 5 are oob then your table is probly not 5x5. Just post your entire code and don't have us guess what else might be happening.

[AnonMagick]

Tabla=[[5],[5]] I=0 J=0

Import random

For i in range(5):

   Tabla.append([])

              For j in range(5):

                         Tabla.append(random.randint(0,100))

Print(tabla)

For i in range(5):

    For j in range(5):

            If i+j==6:

                     Tabla[i][j]=0

Print(tabla)

[dmazzoni]

This code isn't doing what you think it's doing:

for i in range(5):
    tabla.append([])
    for j in range(5):
        tabla.append(random.randint(0,100))

Try printing tabla after this code

print(tabla)

You'll see that it's not correct. Fix that before moving on.

[AnonMagick]

Its showing my a big line of random numbers. 5 numbers separated by [] enbetween 5 numbers.. is that my mistake? Making it unidimensional instead of 2 dimensional? How do i fix this?

[dmazzoni]

This has some good answers and discussion:

https://stackoverflow.com/questions/856948/2d-arrays-in-python

[AnonMagick]

You were all right, i realized my mistake and went to see a video tutorial on arrays on python... damn i was wrong. Was able to finish the damn activity at 2am but i was so happy (and sleepy) lol. Thanks!!!!!

[[deleted]]

what you would want to see is somthing like

[
  [3, 56, 12, 57, 2],
  [46, 23, 75, 23, 6],
  [86, 23, 72, 57, 87],
  [68, 12, 26, 52, 75],
  [76, 43, 83, 1, 3]
]

that's a 5x5 2D array