about write file wrong (Edit directly online)

[deanhystad]

This is my best guess at what you are trying to accomplish. I left out the file write, but it would be very similar to the print.

import random
import itertools

def add_unique(xlist, ylists):
    """Append xlist to ylists only if xlist[i] is not in ylist[i] for
    every value if i.
    """
    for y, x in zip(ylists, xlist):
        if x in y:
            break; # Not unique
    else:
        # Is unique.  Only get here if didn't break out of for loop.
        for ylist, x in zip(ylists, xlist):
            ylist.append(x)

xlist_values = [str(n+1) for n in range(9)]
ylists = [[] for _ in range(9)]
times = 0
while len(ylists[0]) < 9:
    xlist = random.sample(xlist_values, k=9)
    add_unique(xlist, ylists)
    times += 1

print(f"FINISH {times} TIMES")
for index in range(9):
    print(', '.join([ylist[index] for ylist in ylists]))

I am not sure what the code is supposed to do. Since it makes a 9x9 matrix of numbers in the range 1..9 it looks suspiciously like a Sudoku maker. If so it does not make valid Sudoku puzzles. Values are unique for each row and each column, but not for each 3x3 box.