Python create multi dimensional array of of normal array

I want to create a multi dimensional Array out of normal array. When there is a 0 in my start array i want to change the row number by 1.

My start array looks like this:

arr = [1, 2, 3, 0, 4, 5, 6, 0, 7, 8, 9]

My futre multi array should look like this:

multi_arr = [[1, 2, 3],
             [4, 5, 6],
             [7, 8, 9]]

My code looks like this so far:

multi_arr = []
end = len(arr)
i = 0   #row
j = 0   #column

for h in range(end):

   if arr[h] != 0:
       j += 1
       multi_arr[i][j]= arr[h]

   elif arr[i] != 0:
       i += 1

I always get a list index error with this code.

If you really want to work with lists, you dont need a column indexer. You can simply append the value to the correct list.

multi_arr = [[]]  # start with a nested list, since your vector doesnt start with a 0
endi = len(arr)
i = 0   #row

for h in range(endi):

   if arr[h] != 0:
       multi_arr[i].append(arr[h])
   else:
       i += 1
       multi_arr.insert(i,[])  # open new list

output:

[[1, 2, 3], [4, 5, 6], [7, 8, 9]]