You got a space after each number and then a comma, invert the order put first the comma and then a space, thats all!

Tenes un espacio despues de cada nuemro y despues la coma, inverti el orden, pone primero la coma y el espacio despues, cambia eso y ya esta!

Finally I pass the test ...

I try with a totally different approach (incrementing the number) and can't pass the 750 mark in the test either. I'm new coding I start a little over a month ago, so everithing is new for me.

you have to completely change your approach. You cannot sort at any step of the while loop, for example. count is a bad idea too, since you do it in a loop which is itself inside another loop.

starmap and product are from itertools

I test it with my solution and it gives 17962

I think this kata is overrated

Maybe it is because in your pc you use a list of list for examplem [[1,3],[2,5],[6,9]] and a list the test uses a list of tuples ([1,3],[2,5],[6,9])

Did you import it?
from itertools import count

And count(0, 9) will generate an iterator of: 0, 9, 18, 27, 36, ...

I copy & paste the code in my idle and to understand what the count(0,9) is doing and it only shows an error:

File "main.py", line 2, in gen
for x in count(0, 9):
NameError: name 'count' is not defined

How do you obtain the last formula? I was traing to do something like that but i couldn't, feeding all the fishes of the same size in one round was really clever, good job man!

Once it has a reply you can't delete your post.

Can you tell me how to delete it?

Once it has a reply you can't delete your post, but it is fine, just remember to mark your post as having spoiler content (when posting code like this in a solution) and it won't be visible in the home page. This time I've marked both your posts for you.