input: Write a function to rewrite the given Python code using list comprehensions. The original code initializes an empty list called `even_numbers` and appends even numbers from 1 to 20 to this list. If the rewritten code is correct, it should produce the same list.
  assert rewrite_code == [i for i in range(1, 21) if i % 2 == 0]
  assert rewrite_code == [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
output: def rewrite_code():
      return [i for i in range(1, 21) if i % 2 == 0]