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danlessa · Jul 11, 2020 · 92cd4ae · 92cd4ae
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diff --git a/reference_notebooks/.ipynb_checkpoints/task2-checkpoint.ipynb b/reference_notebooks/.ipynb_checkpoints/task2-checkpoint.ipynb
@@ -1,6 +1,201 @@
 {
- "cells": [],
- "metadata": {},
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Defaultdict and namedtuple\n",
+    "\n",
+    "Reference notebook for the second task of the *Python Tricks and Hacks for Productivity* course on Coursera.\n",
+    "\n",
+    "**Instructor**: *Danilo Lessa Bernardineli ([email protected])*"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Put deposits into the account balances"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "account_balances = {'Jonathan': 5.49,\n",
+    "                    'Markus': 1.39}\n",
+    "\n",
+    "deposits = {'Jonathan': 0.49,\n",
+    "            'Markus': 0.39}\n",
+    "\n",
+    "for account, deposit in deposits.items():\n",
+    "    account_balances[account] += deposit\n",
+    "print(account_balances)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "KeyError",
+     "evalue": "'Jonathan'",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
+      "\u001b[0;32m<ipython-input-2-f5ff5002477b>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      7\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      8\u001b[0m \u001b[0;32mfor\u001b[0m \u001b[0maccount\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mdeposit\u001b[0m \u001b[0;32min\u001b[0m \u001b[0mdeposits\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mitems\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 9\u001b[0;31m     \u001b[0maccount_balances\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0maccount\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m+=\u001b[0m \u001b[0mdeposit\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     10\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0maccount_balances\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;31mKeyError\u001b[0m: 'Jonathan'"
+     ]
+    }
+   ],
+   "source": [
+    "account_balances = {}\n",
+    "\n",
+    "deposits = {'Jonathan': 0.49,\n",
+    "            'Markus': 0.39,\n",
+    "            'Jamsheed': 100.00}\n",
+    "\n",
+    "\n",
+    "for account, deposit in deposits.items():\n",
+    "    account_balances[account] += deposit\n",
+    "print(account_balances)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "account_balances = {}\n",
+    "\n",
+    "deposits = {'Jonathan': 0.49,\n",
+    "            'Markus': 0.39,\n",
+    "            'Jamsheed': 100.00}\n",
+    "\n",
+    "for account, deposit in deposits.items():\n",
+    "    if account not in account_balances:\n",
+    "        account_balances[account] = 0.0\n",
+    "    account_balances[account] += deposit\n",
+    "print(account_balances)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from collections import defaultdict\n",
+    "\n",
+    "account_balances = defaultdict(lambda: 15)\n",
+    "\n",
+    "deposits = {'Jonathan': 0.49,\n",
+    "            'Markus': 0.39,\n",
+    "            'Jamsheed': 100.00}\n",
+    "\n",
+    "for account, deposit in deposits.items():\n",
+    "    account_balances[account] += deposit\n",
+    "print(dict(account_balances))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from typing import NamedTuple\n",
+    "\n",
+    "class Deposit(NamedTuple):\n",
+    "    receiver: str\n",
+    "    value: float\n",
+    "        \n",
+    "Deposit(receiver='Markus', value=5.49)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "Deposit(sender='Anderson', value=4.99)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from typing import NamedTuple\n",
+    "\n",
+    "class Deposit(NamedTuple):\n",
+    "    receiver: str\n",
+    "    value: float\n",
+    "\n",
+    "account_balances = defaultdict(lambda: 15)\n",
+    "\n",
+    "deposits = [Deposit(receiver='Markus', value=5.49),\n",
+    "            Deposit(receiver='Jonathan', value=15.49),\n",
+    "            Deposit(receiver='Jamsheed', value=25.49)]\n",
+    "\n",
+    "for deposit in deposits:\n",
+    "    account_balances[deposit.receiver] += deposit.value\n",
+    "print(dict(account_balances))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "account_balances = {}\n",
+    "\n",
+    "deposits = {'Jonathan': 0.49,\n",
+    "            'Markus': 0.39,\n",
+    "            'Jamsheed': 100.00}\n",
+    "\n",
+    "for account, deposit in deposits.items():\n",
+    "    if account not in account_balances:\n",
+    "        account_balances[account] = 0.0\n",
+    "    account_balances[account] += deposit\n",
+    "print(account_balances)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "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": "3.7.6"
+  }
+ },
  "nbformat": 4,
  "nbformat_minor": 4
 }