input: Write a function to rewrite the provided Python code using list comprehensions. The function should take no arguments and return the list containing even numbers from 1 to 20. 
  assert rewrite_using_list_comprehension()==[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
output: def rewrite_using_list_comprehension():
      return [x for x in range(1, 21) if x % 2 == 0]