Rename session numbering to include a leading zero

meetings/2020/session_2_defensive_programming/.ipynb_checkpoints/Untitled-checkpoint.ipynb

-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "# Defensive Programming\n",
-    "\n",
-    "Defensive programming describes concepts and approaches we can use to ensure that...\n",
-    "* Code does what we think it does (i.e. is free of bugs)\n",
-    "* Our programs fail when they should...\n",
-    "* ... and do so with informative error messages (throwback to last session)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  }
- ],
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-  "kernelspec": {
-   "display_name": "Python 3",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
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-   "file_extension": ".py",
-   "mimetype": "text/x-python",
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-   "nbconvert_exporter": "python",
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- "nbformat": 4,
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-}