new_contents: """
  [ref.href] https://projecteuler.net/problem=2
  
  Even Fibonacci numbers.
  
  Each new term in the Fibonacci sequence is generated by adding
  the previous two terms. By starting with 1 and 2, the first 10
  terms will be:
  
  1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
  
  By considering the terms in the Fibonacci sequence whose values
  do not exceed four million, find the sum of the even-valued terms.
  """
  
  def FibonacciGenerator(n):
      yield 0
      a = 0
      b = 1
      fib = a + b
      while fib < n:
          fib = a + b
          yield fib
          temp = a
          a = fib
          b = temp
  
  lim = 4000000
  fgen = FibonacciGenerator(lim)
  fnums = []
  for fib in fgen:
      if fib % 2 == 0:
          fnums.append(fib)
  sm = sum(fnums)
  
  print "The sum of even fibonacci numbers that do not exceed " +\
        str(lim) + " is equal to " + str(sm) + "."
  
subject: Create problem2.py