Using List Comprehension for a number sequence (1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1 …..) in Python

I’m doing exercise questions from A Practical Introduction to Python Programming by Brian Heinold (pg 83) and there was a simpler question:

11. Using a for loop, create the list below, which consists of ones separated by increasingly many
    zeroes. The last two ones in the list should be separated by ten zeroes.
    [1,1,0,1,0,0,1,0,0,0,1,0,0,0,0,1,….]

# Question 11
L = [1]
for i in range(11):
  if i == 0:
    L.append(1)
  else:
    for j in range(i):
      L.append(0)
    L.append(1)
print(L)

15. Use a list comprehension to create the list below, which consists of ones separated by increasingly many zeroes. The last two ones in the list should be separated by ten zeroes.
    [1,1,0,1,0,0,1,0,0,0,1,0,0,0,0,1,….]

I’m having difficulty with converting it into one line using list comprehension. Best I could do was

# Question 15
L = [[1, [0]*i] for i in range(11)]
print(L)
L = [j for row in L for j in row]
print(L)

Which would print:

[[1, []], [1, [0]], [1, [0, 0]], [1, [0, 0, 0]], [1, [0, 0, 0, 0]], [1, [0, 0, 0, 0, 0]], [1, [0, 0, 0, 0, 0, 0]], [1, [0, 0, 0, 0, 0, 0, 0]], [1, [0, 0, 0, 0, 0, 0, 0, 0]], [1, [0, 0, 0, 0, 0, 0, 0, 0, 0]], [1, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]]
[1, [], 1, [0], 1, [0, 0], 1, [0, 0, 0], 1, [0, 0, 0, 0], 1, [0, 0, 0, 0, 0], 1, [0, 0, 0, 0, 0, 0], 1, [0, 0, 0, 0, 0, 0, 0], 1, [0, 0, 0, 0, 0, 0, 0, 0], 1, [0, 0, 0, 0, 0, 0, 0, 0, 0], 1, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]

Flattening the list any further would result in a TypeError: ‘int’ object is not iterable and I would have to add another 1 at the end of the list using a seperate command which I guess would be fine. To add the code for flattening the list kinda goes over my head.

This is a second attempt using if/else statements, that gives the produces the same output and gives the same TypeError for when I try to flatten it completely.

L = [1 if i%2 == 0 else [0]*(i//2) for i in range(22)]
L = [j for row in L for j in row]
print(L)

I just want this as output:

[1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]

Thanks!

>Solution :

You can solve it like this:

L = [j for i in range(11) for j in [1, *([0]*i)]]

or

L = [j for i in range(11) for j in [1, *(0 for k in range(i))]]

Edit
I missed that it should end with a one. Here’s a solution that does that:

L = [1, *(j for i in range(11) for j in [*(0 for k in range(i)), 1])]