[Tutor] The Python way and two dimensional lists

[Phil]

I hope my questions are not becoming too tiresome.

It will require a major effort to rewrite my use of lists in the Python 
way and so I want to make sure that the first steps are correct. The 
first index refers to the columns and the second to the rows.

num_rows = 9
num_cols = 9

solution = [[0 for i in range(num_cols)] for j in range(num_rows)]

solution[0][0] = {7,3}
solution[1][0] = {5}
solution[2][0] = {4,8,6}
solution[3][0] = {7,8}
solution[4][0] = {1}
solution[5][0] = {9,3}
solution[6][0] = {7,9}
solution[7][0] = {4,6,3}
solution[8][0] = {2}

solution[0][1] = {1,2,3}

#print(solution)

for col in solution:
     print(col[0])

print()

for row in solution:
     print(row[1])

If I want to refer to column 6, is it the Python way to say x = col[6]?

Also regarding enumeration. The following is a slight modification to 
Mats code and it gives me exactly what I want:

row = [{7,3},{5},{4,8,6},{7,8},{1},{9,3},{7,9},{4,6,3},{2}]

enum_row = enumerate(row)
row_position = []

for index, enum_row in enumerate(row):
     print('enum_row ',enum_row )
         if i in enum_row:#r:
             icount += 1
             row_position.append(index)

Now returning to the two dimensional list above and assuming that col[0] 
is referring to a row (just for this question only). I'm not sure if 
this is correct because of an error in another section of the code

enum_row = enumerate(col[0]) # instead or row

for index, enum_row in enumerate(col[0]): # instead or row
     print('enum_row ',enum_row )
         if i in enum_row:
             icount += 1

This is where the error is occurring (also from Mats code):

for s in set_list:
     for r in col[0]: # instead of row:
         if s.issubset(r):
             pairs[tuple(sorted(s))] += 1

Traceback (most recent call last):
   File "/usr/lib/python3.9/idlelib/run.py", line 559, in runcode
     exec(code, self.locals)
   File "/home/phil/Python/set_count2.py", line 75, in <module>
     if s.issubset(r):
TypeError: 'int' object is not iterable

Confusion is setting in. I think my use of enumerate is correct and I 
think the way that I'm referencing a row from the solution list is 
correct. If both of those aren't the source of the error then it has to 
do with my use of sets. for r in col[0] doesn't give me the sets 
{7,3},{5} etc.

Searching the Internet for information hasn't made me any wiser yet and 
again I'm sorry to burden the list members with my problems.

-- 
Regards,
Phil