input: Write a function to rewrite the given Python code using list comprehensions. The original code initializes an empty list called `even_numbers` and then appends the even numbers from 1 to 20 to this list. The function should return the list of even numbers using list comprehension.
  
  assert list_comprehension([]) == [i for i in range(1, 21) if i % 2 == 0]
  assert list_comprehension([i for i in range(1, 21) if i % 2 == 0]) == [i for i in range(1, 21) if i % 2 == 0]
  assert list_comprehension([2, 4, 6, 8, 10, 12, 14, 16, 18, 20]) == [i for i in range(1, 21) if i % 2 == 0]
  assert list_comprehension([1, 3, 5, 7, 9, 11, 13, 15, 17, 19]) == [i for i in range(1, 21) if i % 2 == 0]
  assert list_comprehension([]) == [i for i in range(1, 21) if i % 2 == 0]
output: def list_comprehension(lst):
      return [i for i in range(1, 21) if i % 2 == 0]