AWS, Firebase

.ipynb_checkpoints/aws-dynamodb-create-describe-table-checkpoint.ipynb

@@ -0,0 +1,102 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# AWS DynamoDB Create and Describe Table\n",
+    "\n",
+    "This is a companion notebook for the new [Data Science Solutions](https://strtupsci.com) book. The code is explained in the book.\n",
+    "\n",
+    "**IMPORTANT.** The code will only run if you have a local DynamoDB server installed and running on localhost port 8000."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Checking if table exists\n",
+      "Table does not exist\n",
+      "Creating table\n",
+      "Table CensusTest created\n"
+     ]
+    }
+   ],
+   "source": [
+    "import boto3\n",
+    "\n",
+    "resource = boto3.resource(\n",
+    "    'dynamodb',\n",
+    "    endpoint_url='http://localhost:8000')\n",
+    "\n",
+    "client = boto3.client(\n",
+    "    'dynamodb',\n",
+    "    endpoint_url='http://localhost:8000')\n",
+    "\n",
+    "table_to_create = 'Census'\n",
+    "print('Checking if table exists')\n",
+    "\n",
+    "try:\n",
+    "    table_description = client.describe_table(TableName=table_to_create)\n",
+    "    print('Table {} already exists'.format(table_to_create))\n",
+    "    print('Table description:')\n",
+    "    print(table_description)\n",
+    "\n",
+    "# Exception raised by describe_table if table does not exist\n",
+    "except Exception as e:\n",
+    "    if 'ResourceNotFoundException' in str(e):\n",
+    "        print('Table does not exist')\n",
+    "        print('Creating table')\n",
+    "        table = resource.create_table(\n",
+    "            TableName=table_to_create,\n",
+    "            KeySchema=[\n",
+    "                {'AttributeName': 'uid', 'KeyType': 'HASH'}\n",
+    "            ],\n",
+    "            AttributeDefinitions=[\n",
+    "                {'AttributeName': 'uid', 'AttributeType': 'N' }\n",
+    "            ],\n",
+    "            ProvisionedThroughput={\n",
+    "                'ReadCapacityUnits': 10,\n",
+    "                'WriteCapacityUnits': 10\n",
+    "            }\n",
+    "        )\n",
+    "        \n",
+    "        #wait for contirmation that the table exists\n",
+    "        table.meta.client.get_waiter(\n",
+    "            'table_exists').wait(TableName=table_to_create)\n",
+    "        print('Table {} created'.format(table_to_create))\n",
+    "    else:\n",
+    "        print('Table cannot be created')\n",
+    "        raise"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.6.0"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

.ipynb_checkpoints/aws-dynamodb-delete-table-checkpoint.ipynb

@@ -0,0 +1,57 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Table Census deleted\n"
+     ]
+    }
+   ],
+   "source": [
+    "import boto3\n",
+    "\n",
+    "resource = boto3.resource('dynamodb', endpoint_url='http://localhost:8000')\n",
+    "\n",
+    "table_to_delete = 'Census'\n",
+    "\n",
+    "try:\n",
+    "    table = resource.Table(table_to_delete)\n",
+    "    table.delete()\n",
+    "    print('Table {} deleted'.format(table_to_delete))\n",
+    "\n",
+    "except Exception as e:\n",
+    "    if 'ResourceNotFoundException' in str(e):\n",
+    "        print('Table {} does not exist'.format(table_to_delete))"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.6.0"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}