Add initial version of chapter 01's summary
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@ -39,6 +39,8 @@ Alternatively, the content can be viewed in a web browser
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[exercises 2 <img height="12" style="display: inline-block" src="static/link/to_nb.png">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/chapter_01_elements/03_exercises.ipynb)
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[exercises 2 <img height="12" style="display: inline-block" src="static/link/to_nb.png">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/chapter_01_elements/03_exercises.ipynb)
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[<img height="12" style="display: inline-block" src="static/link/to_mb.png">](https://mybinder.org/v2/gh/webartifex/intro-to-python/develop?urlpath=lab/tree/chapter_01_elements/03_exercises.ipynb)
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[<img height="12" style="display: inline-block" src="static/link/to_mb.png">](https://mybinder.org/v2/gh/webartifex/intro-to-python/develop?urlpath=lab/tree/chapter_01_elements/03_exercises.ipynb)
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[summary <img height="12" style="display: inline-block" src="static/link/to_nb.png">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/chapter_01_elements/04_summary.ipynb)
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154
chapter_01_elements/04_summary.ipynb
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chapter_01_elements/04_summary.ipynb
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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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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"\n",
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"# Chapter 1: Elements of a Program"
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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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"slideshow": {
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"slide_type": "skip"
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}
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},
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"source": [
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"## TL;DR"
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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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"slideshow": {
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"slide_type": "skip"
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}
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},
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"source": [
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"We end each chapter with a summary of the main points (i.e., **TL;DR** = \"too long; didn't read\"). The essence in this first chapter is that just as a sentence in a real language like English may be decomposed into its parts (e.g., subject, predicate, and objects), the same may be done with programming languages.\n",
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"\n",
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"- program\n",
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" - **sequence** of **instructions** that specify how to perform a computation (= a \"recipe\")\n",
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" - a \"black box\" that processes **inputs** and transforms them into meaningful **outputs** in a *deterministic* way\n",
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" - conceptually similar to a mathematical function $f$ that maps some input $x$ to an output $y = f(x)$\n",
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"\n",
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"\n",
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"- input (examples)\n",
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" - data from a CSV file\n",
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" - text entered on a command line\n",
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" - data obtained from a database\n",
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" - etc.\n",
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"\n",
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"\n",
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"- output (examples)\n",
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" - result of a computation (e.g., statistical summary of a sample dataset)\n",
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" - a \"side effect\" (e.g., a transformation of raw input data into cleaned data)\n",
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" - a physical \"behavior\" (e.g., a robot moving or a document printed)\n",
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" - etc.\n",
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"\n",
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"\n",
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"- objects\n",
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" - distinct and well-contained areas/parts of the memory that hold the actual data\n",
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" - the concept by which Python manages the memory for us\n",
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" - can be classified into objects of the same **type** (i.e., same abstract \"structure\" but different concrete data)\n",
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" - built-in objects (incl. **literals**) vs. user-defined objects (cf., [Chapter 11 <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_nb.png\">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/chapter_11_classes/00_content.ipynb))\n",
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" - e.g., `1`, `1.0`, and `\"one\"` are three different objects of distinct types that are also literals (i.e., by the way we type them into the command line Python knows what the value and type are)\n",
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"\n",
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"\n",
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"- variables\n",
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" - storage of intermediate **state**\n",
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" - are **names** referencing **objects** in **memory**\n",
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" - e.g., `x = 1` creates the variable `x` that references the object `1`\n",
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"\n",
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"\n",
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"- operators\n",
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" - special built-in symbols that perform operations with objects in memory\n",
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" - usually, operate with one or two objects\n",
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" - e.g., addition `+`, subtraction `-`, multiplication `*`, and division `/` all take two objects, whereas the negation `-` only takes one\n",
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"\n",
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"\n",
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"- expressions\n",
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" - **combinations** of **variables** (incl. **literals**) and **operators**\n",
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" - do *not* change the involved objects/state of the program\n",
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" - evaluate to a **value** (i.e., the \"result\" of the expression, usually a new object)\n",
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" - e.g., `x + 2` evaluates to the (new) object `3` and `1 - 1.0` to `0.0`\n",
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"\n",
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"\n",
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"- statements\n",
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" - instructions that **\"do\" something** and **have side effects** in memory\n",
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" - (re-)assign names to (different) objects, *change* an existing object *in place*, or, more conceptually, *change* the state of the program\n",
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" - usually, work with expressions\n",
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" - e.g., the assignment statement `=` makes a name reference an object\n",
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"\n",
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"\n",
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"- comments\n",
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" - **prose** supporting a **human's understanding** of the program\n",
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" - ignored by Python\n",
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"\n",
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"\n",
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"- functions (cf., [Chapter 2 <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_nb.png\">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/chapter_02_functions/00_content.ipynb))\n",
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" - named sequences of instructions\n",
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" - the smaller parts in a larger program\n",
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" - make a program more modular and thus easier to understand\n",
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" - include [built-in functions <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_py.png\">](https://docs.python.org/3/library/functions.html) like [print() <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_py.png\">](https://docs.python.org/3/library/functions.html#print), [sum() <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_py.png\">](https://docs.python.org/3/library/functions.html#sum), or [len() <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_py.png\">](https://docs.python.org/3/library/functions.html#len)\n",
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"\n",
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"\n",
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"- flow control (cf., [Chapter 3 <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_nb.png\">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/chapter_03_conditionals/00_content.ipynb) and [Chapter 4 <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_nb.png\">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/chapter_04_iteration/00_content.ipynb))\n",
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" - expression of **business logic** or an **algorithm**\n",
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" - conditional execution of parts of a program (e.g., `if` statements)\n",
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" - repetitive execution of parts of a program (e.g., `for`-loops)"
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]
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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": "3.8.6"
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},
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"livereveal": {
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"auto_select": "code",
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"auto_select_fragment": true,
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"scroll": true,
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"theme": "serif"
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},
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"toc": {
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"base_numbering": 1,
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"nav_menu": {},
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"number_sections": false,
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"sideBar": true,
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"skip_h1_title": true,
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"title_cell": "Table of Contents",
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"title_sidebar": "Contents",
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"toc_cell": false,
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"toc_position": {
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"height": "calc(100% - 180px)",
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"left": "10px",
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"top": "150px",
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"width": "303.333px"
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},
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"toc_section_display": false,
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"toc_window_display": false
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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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