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 iterates through numbers from 1 to 20, appending the even numbers to the list. Return the equivalent list comprehension.
  
  
  assert rewrite_using_list_comprehension() == [i for i in range(1, 21) if i % 2 == 0]
  
output: def rewrite_using_list_comprehension():
      return [i for i in range(1, 21) if i % 2 == 0]