input: 
  def filter_even_numbers(numbers):
      """This function takes a list of integers and returns a list of even numbers from the input list.
      
      Example:
      >>> 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