matrix number assignement to the random indices

[deanhystad]

I do not see purpose of tum or new_list. Essentially new_list is "not rassal". new_list has a use if you were doing this:

row = [5]*COLUMNS
for i in new_list:
    row[i] = random.whatever()

But how is that any different than this?

row = [5]*COLUMNS
for i in rassal:
    row[i] = random.whatever()

rassal is just a random selection. How is one random selection different from another?
I would solve the problem like this

import random

COLUMNS = 10
ROWS = 4
rassal = set(random.sample(range(COLUMNS), k=COLUMNS//2))
matrix = [[5 if c in rassal else random.randint(5, 10) for c in range(COLUMNS)] for _ in range(ROWS)]

print(rassal)
for row in matrix:
    values = [f"{value:>2}" for value in row]
    print(", ".join(values))

Output:
[1, 2, 5, 6, 9]
10,  5,  5,  8, 10,  5,  5,  7, 10,  5
10,  5,  5,  5,  7,  5,  5,  6,  7,  5
 9,  5,  5,  5,  6,  5,  5,  9,  9,  5
 6,  5,  5, 10,  8,  5,  5,  7,  9,  5

About your code. In your code you first add a bunch of 5's to w, then you add a bunch of random numbers to w. You never use the contents of rassal or new_list, you only use their length.