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‎reference_notebooks/.ipynb_checkpoints/task2-checkpoint.ipynb

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{
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"cells": [],
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"metadata": {},
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Defaultdict and namedtuple\n",
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"\n",
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"Reference notebook for the second task of the *Python Tricks and Hacks for Productivity* course on Coursera.\n",
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"\n",
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"**Instructor**: *Danilo Lessa Bernardineli ([email protected])*"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Put deposits into the account balances"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"account_balances = {'Jonathan': 5.49,\n",
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" 'Markus': 1.39}\n",
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"\n",
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"deposits = {'Jonathan': 0.49,\n",
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" 'Markus': 0.39}\n",
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"\n",
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"for account, deposit in deposits.items():\n",
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" account_balances[account] += deposit\n",
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"print(account_balances)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [
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{
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"ename": "KeyError",
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"evalue": "'Jonathan'",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mKeyError\u001b[0m Traceback (most recent call last)",
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"\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",
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"\u001b[0;31mKeyError\u001b[0m: 'Jonathan'"
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]
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}
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],
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"source": [
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"account_balances = {}\n",
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"\n",
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"deposits = {'Jonathan': 0.49,\n",
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" 'Markus': 0.39,\n",
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" 'Jamsheed': 100.00}\n",
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"\n",
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"\n",
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"for account, deposit in deposits.items():\n",
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" account_balances[account] += deposit\n",
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"print(account_balances)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"account_balances = {}\n",
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"\n",
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"deposits = {'Jonathan': 0.49,\n",
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" 'Markus': 0.39,\n",
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" 'Jamsheed': 100.00}\n",
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"\n",
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"for account, deposit in deposits.items():\n",
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" if account not in account_balances:\n",
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" account_balances[account] = 0.0\n",
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" account_balances[account] += deposit\n",
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"print(account_balances)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"from collections import defaultdict\n",
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"\n",
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"account_balances = defaultdict(lambda: 15)\n",
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"\n",
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"deposits = {'Jonathan': 0.49,\n",
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" 'Markus': 0.39,\n",
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" 'Jamsheed': 100.00}\n",
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"\n",
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"for account, deposit in deposits.items():\n",
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" account_balances[account] += deposit\n",
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"print(dict(account_balances))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"from typing import NamedTuple\n",
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"\n",
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"class Deposit(NamedTuple):\n",
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" receiver: str\n",
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" value: float\n",
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" \n",
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"Deposit(receiver='Markus', value=5.49)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"Deposit(sender='Anderson', value=4.99)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"from typing import NamedTuple\n",
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"\n",
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"class Deposit(NamedTuple):\n",
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" receiver: str\n",
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" value: float\n",
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"\n",
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"account_balances = defaultdict(lambda: 15)\n",
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"\n",
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"deposits = [Deposit(receiver='Markus', value=5.49),\n",
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" Deposit(receiver='Jonathan', value=15.49),\n",
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" Deposit(receiver='Jamsheed', value=25.49)]\n",
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"\n",
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"for deposit in deposits:\n",
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" account_balances[deposit.receiver] += deposit.value\n",
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"print(dict(account_balances))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"account_balances = {}\n",
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"\n",
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"deposits = {'Jonathan': 0.49,\n",
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" 'Markus': 0.39,\n",
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" 'Jamsheed': 100.00}\n",
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"\n",
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"for account, deposit in deposits.items():\n",
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" if account not in account_balances:\n",
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" account_balances[account] = 0.0\n",
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" account_balances[account] += deposit\n",
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"print(account_balances)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.6"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 4
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}

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