ch01: added Jupyter Notebook
This commit is contained in:
Luciano Ramalho
parent
34da8a067a
commit
0e53341809
1
.gitignore
vendored
1
.gitignore
vendored
@ -1,3 +1,4 @@
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.ipynb_checkpoints/
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.vscode/
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.venv3?/
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*.sublime-project
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606
01-data-model/data-model.ipynb
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606
01-data-model/data-model.ipynb
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@ -0,0 +1,606 @@
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{
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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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"# Chapter 1 — The Python Data Model\n",
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"\n",
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"**Sections with examples:**\n",
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"\n",
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"* [A Pythonic Card Deck](#A-Pythonic-Card-Deck)\n",
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"* [Emulating Numeric Types](#Emulating-Numeric-Types)"
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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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"## A Pythonic Card Deck"
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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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"### Example 1-1. A deck as a sequence of playing cards"
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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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"import collections\n",
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"\n",
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"Card = collections.namedtuple('Card', ['rank', 'suit'])\n",
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"\n",
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"class FrenchDeck:\n",
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" ranks = [str(n) for n in range(2, 11)] + list('JQKA')\n",
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" suits = 'spades diamonds clubs hearts'.split()\n",
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"\n",
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" def __init__(self):\n",
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" self._cards = [Card(rank, suit) for suit in self.suits for rank in self.ranks]\n",
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"\n",
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" def __len__(self):\n",
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" return len(self._cards)\n",
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"\n",
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" def __getitem__(self, position):\n",
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" return self._cards[position]"
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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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"data": {
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"text/plain": [
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"Card(rank='7', suit='diamonds')"
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]
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},
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"execution_count": 2,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"beer_card = Card('7', 'diamonds')\n",
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"beer_card"
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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": 3,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"52"
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]
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},
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"execution_count": 3,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"deck = FrenchDeck()\n",
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"len(deck)"
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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": 4,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"Card(rank='2', suit='spades')"
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]
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},
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"execution_count": 4,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"deck[0]"
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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": 5,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"Card(rank='A', suit='hearts')"
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]
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},
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"execution_count": 5,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"deck[-1]"
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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": 6,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"Card(rank='2', suit='hearts')"
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]
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},
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"execution_count": 6,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"from random import choice\n",
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"\n",
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"choice(deck)"
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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": 7,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[Card(rank='2', suit='spades'),\n",
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" Card(rank='3', suit='spades'),\n",
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" Card(rank='4', suit='spades')]"
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]
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},
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"execution_count": 7,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"deck[:3]"
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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": 8,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[Card(rank='A', suit='spades'),\n",
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" Card(rank='A', suit='diamonds'),\n",
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" Card(rank='A', suit='clubs'),\n",
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" Card(rank='A', suit='hearts')]"
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]
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},
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"execution_count": 8,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"deck[12::13]"
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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": 9,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Card(rank='2', suit='spades')\n",
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"Card(rank='3', suit='spades')\n",
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"Card(rank='4', suit='spades')\n",
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"Card(rank='5', suit='spades')\n",
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"Card(rank='6', suit='spades')\n",
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"Card(rank='7', suit='spades')\n",
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"Card(rank='8', suit='spades')\n",
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"Card(rank='9', suit='spades')\n",
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"Card(rank='10', suit='spades')\n",
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"Card(rank='J', suit='spades')\n",
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"Card(rank='Q', suit='spades')\n",
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"Card(rank='K', suit='spades')\n",
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"Card(rank='A', suit='spades')\n",
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"Card(rank='2', suit='diamonds')\n",
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"Card(rank='3', suit='diamonds')\n",
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"Card(rank='4', suit='diamonds')\n",
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"Card(rank='5', suit='diamonds')\n",
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"Card(rank='6', suit='diamonds')\n",
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"Card(rank='7', suit='diamonds')\n",
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"Card(rank='8', suit='diamonds')\n",
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"Card(rank='9', suit='diamonds')\n",
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"Card(rank='10', suit='diamonds')\n",
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"Card(rank='J', suit='diamonds')\n",
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"Card(rank='Q', suit='diamonds')\n",
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"Card(rank='K', suit='diamonds')\n",
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"Card(rank='A', suit='diamonds')\n",
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"Card(rank='2', suit='clubs')\n",
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"Card(rank='3', suit='clubs')\n",
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"Card(rank='4', suit='clubs')\n",
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"Card(rank='5', suit='clubs')\n",
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"Card(rank='6', suit='clubs')\n",
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"Card(rank='7', suit='clubs')\n",
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"Card(rank='8', suit='clubs')\n",
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"Card(rank='9', suit='clubs')\n",
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"Card(rank='10', suit='clubs')\n",
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"Card(rank='J', suit='clubs')\n",
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"Card(rank='Q', suit='clubs')\n",
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"Card(rank='K', suit='clubs')\n",
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"Card(rank='A', suit='clubs')\n",
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"Card(rank='2', suit='hearts')\n",
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"Card(rank='3', suit='hearts')\n",
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"Card(rank='4', suit='hearts')\n",
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"Card(rank='5', suit='hearts')\n",
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"Card(rank='6', suit='hearts')\n",
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"Card(rank='7', suit='hearts')\n",
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"Card(rank='8', suit='hearts')\n",
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"Card(rank='9', suit='hearts')\n",
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"Card(rank='10', suit='hearts')\n",
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"Card(rank='J', suit='hearts')\n",
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"Card(rank='Q', suit='hearts')\n",
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"Card(rank='K', suit='hearts')\n",
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"Card(rank='A', suit='hearts')\n"
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]
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}
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],
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"source": [
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"for card in deck:\n",
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" print(card)"
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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": 10,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Card(rank='A', suit='hearts')\n",
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"Card(rank='K', suit='hearts')\n",
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"Card(rank='Q', suit='hearts')\n",
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"Card(rank='J', suit='hearts')\n",
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"Card(rank='10', suit='hearts')\n",
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"Card(rank='9', suit='hearts')\n",
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"Card(rank='8', suit='hearts')\n",
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"Card(rank='7', suit='hearts')\n",
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"Card(rank='6', suit='hearts')\n",
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"Card(rank='5', suit='hearts')\n",
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"Card(rank='4', suit='hearts')\n",
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"Card(rank='3', suit='hearts')\n",
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"Card(rank='2', suit='hearts')\n",
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"Card(rank='A', suit='clubs')\n",
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"Card(rank='K', suit='clubs')\n",
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"Card(rank='Q', suit='clubs')\n",
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"Card(rank='J', suit='clubs')\n",
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"Card(rank='10', suit='clubs')\n",
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"Card(rank='9', suit='clubs')\n",
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"Card(rank='8', suit='clubs')\n",
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"Card(rank='7', suit='clubs')\n",
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"Card(rank='6', suit='clubs')\n",
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"Card(rank='5', suit='clubs')\n",
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"Card(rank='4', suit='clubs')\n",
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"Card(rank='3', suit='clubs')\n",
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"Card(rank='2', suit='clubs')\n",
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"Card(rank='A', suit='diamonds')\n",
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"Card(rank='K', suit='diamonds')\n",
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"Card(rank='Q', suit='diamonds')\n",
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"Card(rank='J', suit='diamonds')\n",
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"Card(rank='10', suit='diamonds')\n",
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"Card(rank='9', suit='diamonds')\n",
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"Card(rank='8', suit='diamonds')\n",
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"Card(rank='7', suit='diamonds')\n",
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"Card(rank='6', suit='diamonds')\n",
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"Card(rank='5', suit='diamonds')\n",
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"Card(rank='4', suit='diamonds')\n",
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"Card(rank='3', suit='diamonds')\n",
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"Card(rank='2', suit='diamonds')\n",
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"Card(rank='A', suit='spades')\n",
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"Card(rank='K', suit='spades')\n",
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"Card(rank='Q', suit='spades')\n",
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"Card(rank='J', suit='spades')\n",
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"Card(rank='10', suit='spades')\n",
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"Card(rank='9', suit='spades')\n",
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"Card(rank='8', suit='spades')\n",
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"Card(rank='7', suit='spades')\n",
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"Card(rank='6', suit='spades')\n",
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"Card(rank='5', suit='spades')\n",
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"Card(rank='4', suit='spades')\n",
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"Card(rank='3', suit='spades')\n",
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"Card(rank='2', suit='spades')\n"
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]
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}
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],
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"source": [
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"for card in reversed(deck):\n",
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" print(card)"
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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": 11,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"True"
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]
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},
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"execution_count": 11,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"Card('Q', 'hearts') in deck"
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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": 12,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"False"
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]
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},
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"execution_count": 12,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"Card('7', 'beasts') in deck"
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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": 13,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Card(rank='2', suit='clubs')\n",
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"Card(rank='2', suit='diamonds')\n",
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"Card(rank='2', suit='hearts')\n",
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"Card(rank='2', suit='spades')\n",
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"Card(rank='3', suit='clubs')\n",
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"Card(rank='3', suit='diamonds')\n",
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"Card(rank='3', suit='hearts')\n",
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"Card(rank='3', suit='spades')\n",
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"Card(rank='4', suit='clubs')\n",
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"Card(rank='4', suit='diamonds')\n",
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"Card(rank='4', suit='hearts')\n",
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"Card(rank='4', suit='spades')\n",
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"Card(rank='5', suit='clubs')\n",
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"Card(rank='5', suit='diamonds')\n",
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"Card(rank='5', suit='hearts')\n",
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"Card(rank='5', suit='spades')\n",
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"Card(rank='6', suit='clubs')\n",
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"Card(rank='6', suit='diamonds')\n",
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"Card(rank='6', suit='hearts')\n",
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"Card(rank='6', suit='spades')\n",
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"Card(rank='7', suit='clubs')\n",
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"Card(rank='7', suit='diamonds')\n",
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"Card(rank='7', suit='hearts')\n",
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"Card(rank='7', suit='spades')\n",
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"Card(rank='8', suit='clubs')\n",
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"Card(rank='8', suit='diamonds')\n",
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"Card(rank='8', suit='hearts')\n",
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"Card(rank='8', suit='spades')\n",
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"Card(rank='9', suit='clubs')\n",
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"Card(rank='9', suit='diamonds')\n",
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"Card(rank='9', suit='hearts')\n",
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"Card(rank='9', suit='spades')\n",
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"Card(rank='10', suit='clubs')\n",
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"Card(rank='10', suit='diamonds')\n",
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"Card(rank='10', suit='hearts')\n",
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"Card(rank='10', suit='spades')\n",
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"Card(rank='J', suit='clubs')\n",
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"Card(rank='J', suit='diamonds')\n",
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"Card(rank='J', suit='hearts')\n",
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"Card(rank='J', suit='spades')\n",
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"Card(rank='Q', suit='clubs')\n",
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"Card(rank='Q', suit='diamonds')\n",
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"Card(rank='Q', suit='hearts')\n",
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"Card(rank='Q', suit='spades')\n",
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"Card(rank='K', suit='clubs')\n",
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"Card(rank='K', suit='diamonds')\n",
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"Card(rank='K', suit='hearts')\n",
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"Card(rank='K', suit='spades')\n",
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"Card(rank='A', suit='clubs')\n",
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"Card(rank='A', suit='diamonds')\n",
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"Card(rank='A', suit='hearts')\n",
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"Card(rank='A', suit='spades')\n"
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]
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}
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],
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"source": [
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"suit_values = dict(spades=3, hearts=2, diamonds=1, clubs=0)\n",
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"\n",
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"def spades_high(card):\n",
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" rank_value = FrenchDeck.ranks.index(card.rank)\n",
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" return rank_value * len(suit_values) + suit_values[card.suit]\n",
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"\n",
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"for card in sorted(deck, key=spades_high):\n",
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" print(card)"
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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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"## Emulating Numeric Types"
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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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"### Example 1-2. A simple two-dimensional vector class"
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]
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},
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||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 14,
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"import math\n",
|
||||
"\n",
|
||||
"class Vector:\n",
|
||||
"\n",
|
||||
" def __init__(self, x=0, y=0):\n",
|
||||
" self.x = x\n",
|
||||
" self.y = y\n",
|
||||
"\n",
|
||||
" def __repr__(self):\n",
|
||||
" return 'Vector(%r, %r)' % (self.x, self.y)\n",
|
||||
"\n",
|
||||
" def __abs__(self):\n",
|
||||
" return math.hypot(self.x, self.y)\n",
|
||||
"\n",
|
||||
" def __bool__(self):\n",
|
||||
" return bool(abs(self))\n",
|
||||
"\n",
|
||||
" def __add__(self, other):\n",
|
||||
" x = self.x + other.x\n",
|
||||
" y = self.y + other.y\n",
|
||||
" return Vector(x, y)\n",
|
||||
"\n",
|
||||
" def __mul__(self, scalar):\n",
|
||||
" return Vector(self.x * scalar, self.y * scalar)"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 15,
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"data": {
|
||||
"text/plain": [
|
||||
"Vector(4, 5)"
|
||||
]
|
||||
},
|
||||
"execution_count": 15,
|
||||
"metadata": {},
|
||||
"output_type": "execute_result"
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"v1 = Vector(2, 4)\n",
|
||||
"v2 = Vector(2, 1)\n",
|
||||
"v1 + v2"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 16,
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"data": {
|
||||
"text/plain": [
|
||||
"5.0"
|
||||
]
|
||||
},
|
||||
"execution_count": 16,
|
||||
"metadata": {},
|
||||
"output_type": "execute_result"
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"v = Vector(3, 4)\n",
|
||||
"abs(v)"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 17,
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"data": {
|
||||
"text/plain": [
|
||||
"Vector(9, 12)"
|
||||
]
|
||||
},
|
||||
"execution_count": 17,
|
||||
"metadata": {},
|
||||
"output_type": "execute_result"
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"v * 3"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 18,
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"data": {
|
||||
"text/plain": [
|
||||
"15.0"
|
||||
]
|
||||
},
|
||||
"execution_count": 18,
|
||||
"metadata": {},
|
||||
"output_type": "execute_result"
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"abs(v * 3)"
|
||||
]
|
||||
}
|
||||
],
|
||||
"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": "3.7.2"
|
||||
}
|
||||
},
|
||||
"nbformat": 4,
|
||||
"nbformat_minor": 2
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user