     "source": [
      "def fib_iterative(n):\n",
      "    a = 0        \n",
      "    b = 1\n",
      "    for _ in xrange(n):\n",
      "        a, b = b, a + b\n",
      "    return a"
     ]
    },
    {
 
</s> remove     "    for l in xrange(lower, upper + 1):\n",
    "        for u in xrange(lower, upper + 1):\n",
 </s> add     "    for l in range(lower, upper + 1):\n",
    "        for u in range(lower, upper + 1):\n", </s> remove     "    for i in xrange(start + 1, len(data)):\n",
 </s> add     "    for i in range(start + 1, len(data)):\n", </s> remove     "    for i in xrange(0, len(data) - 1):\n",
 </s> add     "    for i in range(0, len(data) - 1):\n", </s> remove     "    for i in xrange(size/2):\n",
 </s> add     "    for i in range(size/2):\n", </s> remove     "    for i in xrange(1, cycles+1):\n",
 </s> add     "    for i in range(1, cycles+1):\n",
    "    for _ in range(n):\n",
     "source": [
      "def fib_iterative(n):\n",
      "    a = 0        \n",
      "    b = 1\n",
    "    for _ in range(n):\n",
      "        a, b = b, a + b\n",
      "    return a"
     ]
    },
    {
keep keep keep keep replace keep keep keep keep keep
 Changed xrange to range to be compatible with Python 3. 
recursion_dynamic/fibonacci/fibonacci_solution.ipynb