input: def filter_even_numbers(numbers):
      """ This function takes a list of integers and returns a list of only the even numbers.
      >>> filter_even_numbers([3, 4, 5, 6, 7])
      [4, 6]
      """
      even_numbers = []
      for i in numbers:
          if i % 2 == 0:
              even_numbers.append(i)
      return even_numbers
output:     even_numbers = []
      for i in numbers:
          if i % 2 == 0:
              even_numbers.append(i)
      return even_numbers