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{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import numpy as np\n",

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{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## reverse##\n",
    "Define a function called __reverse__ that takes a string text and returns that string in reverse. For example: reverse(\"abcd\") should return \"dcba\".\n",
    "\n",
    "You may not use __reversed  or [::-1]__ to help you with this.\n",

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{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Write a function called digit_sum that takes a positive integer n as input and returns the sum of all that number's digits. For example: digit_sum(1234) should return 10 which is 1 + 2 + 3 + 4. (Assume that the number you are given will always be positive.)\n",
    "\n",
    "One way might be to convert the integer to a string with str(), iterate over it, and turn the substrings back into integers with int() to do the addition.\n",
    "\n"

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