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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Doctests"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Trying:\n",
      "    add(7,6)\n",
      "Expecting:\n",
      "    13\n",
      "ok\n",
      "1 items had no tests:\n",
      "    __main__\n",
      "1 items passed all tests:\n",
      "   1 tests in __main__.add\n",
      "1 tests in 2 items.\n",
      "1 passed and 0 failed.\n",
      "Test passed.\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "TestResults(failed=0, attempted=1)"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import doctest\n",
    "\n",
    "\n",
    "def add(a, b):\n",
    "    \"\"\"\n",
    "    This is a test:\n",
    "    >>> add(7,6)\n",
    "    13\n",
    "    \"\"\"\n",
    "    return a + b\n",
    "\n",
    "\n",
    "doctest.testmod(verbose=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Debugging"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import doctest\n",
    "\n",
    "\n",
    "doctest.testmod()\n",
    "\n",
    "\n",
    "def multiply(a, b):\n",
    "    \"\"\"\n",
    "    This is a test:\n",
    "    >>> multiply(2, 2)\n",
    "    5\n",
    "    \"\"\"\n",
    "    import pdb\n",
    "\n",
    "    pdb.set_trace()\n",
    "    return a * b"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. `import pdb` importiert den Python Debugger\n",
    "2. `pdb.set_trace()` erstellt einen sog. *Breakpoint*, der den Python-Debugger startet.\n",
    "\n",
    "<div class=\"alert alert-block alert-info\">\n",
    "\n",
    "**See also:**\n",
    "\n",
    "* [pdb – The Python Debugger](https://docs.python.org/3/library/pdb.html)\n",
    "</div>"
   ]
  }
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