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Expand OOP introductory notebook (empa-scientific-it#213)
Co-authored-by: despadam <despina.adamopoulou@empa.ch> Co-authored-by: Edoardo Baldi <edoardo.baldi@empa.ch>
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‎object_oriented_programming.ipynb

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"metadata": {},
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"source": [
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"# Table of Contents\n",
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"\n",
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"- [References](#References)\n",
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"- [A `class` as a blueprint of objects](#A-class-as-a-blueprint-of-objects)\n",
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"- [Properties and methods](#Properties-and-methods)\n",
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"- [Python's *special methods*](#Python's-*special-methods*)\n",
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" - [`__str__` and `__repr__`](#__str__-and-__repr__)\n",
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" - [Exercise 1: Ice cream scoop 🌶️](#Exercise-1:-Ice-cream-scoop-🌶️)\n",
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" - [Comparison methods](#Comparison-methods)\n",
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" - [Exercise 2: Ice cream bowl 🌶️🌶️](#Exercise-2:-Ice-cream-bowl-🌶️🌶️)\n",
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"- [The `@property` keyword](#The-@property-keyword)\n",
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"- [Quick glossary](#Quick-glossary)\n",
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"- [Exercise 3: Intcode computer 🌶️🌶️🌶️](#Exercise-3:-Intcode-computer-🌶️🌶️🌶️)"
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" - [Object-oriented Programming](#Object-oriented-Programming)\n",
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" - [References](#References)\n",
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" - [A `class` as a blueprint of objects](#A-class-as-a-blueprint-of-objects)\n",
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" - [Properties and methods](#Properties-and-methods)\n",
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" - [Python's *special methods*](#Python's-*special-methods*)\n",
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" - [`__str__` and `__repr__`](#__str__-and-__repr__)\n",
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" - [Exercise 1: Ice cream scoop 🌶️](#Exercise-1:-Ice-cream-scoop-🌶️)\n",
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" - [Exercise 2: Ice cream bowl 🌶️🌶️](#Exercise-2:-Ice-cream-bowl-🌶️🌶️)\n",
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" - [Comparison methods](#Comparison-methods)\n",
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" - [Exercise 3: Ice cream shop 🌶️🌶️🌶️](#Exercise-3:-Ice-cream-shop-🌶️🌶️🌶️)\n",
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" - [The `@property` keyword](#The-@property-keyword)\n",
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" - [Quick glossary](#Quick-glossary)\n",
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" - [Quiz](#Quiz)\n",
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" - [Exercise 4: Intcode computer 🌶️🌶️🌶️🌶️](#Exercise-4:-Intcode-computer-🌶️🌶️🌶️🌶️)"
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]
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},
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{
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"id": "0f394fcf-6dca-4867-b098-51e97adcd268",
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"metadata": {},
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"source": [
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"Special methods are methods that Python define automatically. If you define a custom class, then you are responsible of definining the **expected behavior** of these methods. Otherwise, Python will fallback to the default, built-in definition, or it will raise an error if it doesn't know what to do.\n",
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"Special methods are methods that Python defines automatically. If you define a custom class, then you are responsible of defining the **expected behavior** of these methods. Otherwise, Python will fallback to the default, built-in definition, or it will raise an error if it doesn't know what to do.\n",
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"\n",
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"These are also called **dunder methods**, that is, \"double-underscore methods\", because their names look like `__method__`. There are special **attributes** as well."
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]
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"id": "0d793886-49fd-4300-87e5-664fc7a3eb3c",
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"metadata": {},
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"source": [
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"As you can see we still get that default. That's because here Python is **not** converting `r1` to a string, but instead looking for a string *representation* of the object. It is looking for the [`__repr__` method](https://docs.python.org/3/reference/datamodel.html#object.__repr__), which is defined as\n",
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"As you can see we still get the default. That's because here Python is **not** converting `r1` to a string, but instead looking for a string *representation* of the object. It is looking for the [`__repr__` method](https://docs.python.org/3/reference/datamodel.html#object.__repr__), which is defined as\n",
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"\n",
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"> the “official” string representation of an object\n",
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"\n",
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"\n",
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"<div class=\"alert alert-block alert-warning\">\n",
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" <h4><b>Question</b></h4>\n",
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" Complete the solution function such that it creates <strong>three</strong> instances of the <code>Scoop</code> class with the following flavors: chocolate, vanilla, persimmon. This function should return a list that collects the <strong>string representations</strong> of the ice cream scoops.\n",
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" Complete the solution function such that it creates an instance of the <code>Scoop</code> class for every flavor contained in the argument <code>flavors</code>. This function should return a list that collects the <strong>string representations</strong> of the ice cream scoops.\n",
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"</div>"
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]
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},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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"class Scoop:\n",
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" \"\"\"A class representing a single scoop of ice cream\"\"\"\n",
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" # Write your class implementation here\n",
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"\n",
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"def solution_ice_cream_scoop(flavors: tuple[str]) -> list[str]:\n",
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"\n",
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"flavors = # TODO: create a tuple containing the flavors\n",
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" class Scoop:\n",
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" \"\"\"A class representing a single scoop of ice cream\"\"\"\n",
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" # Write your class implementation here\n",
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"\n",
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" # Write your solution here\n",
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" pass"
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]
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},
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{
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"cell_type": "markdown",
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"id": "4abfe0ba-c893-4ffd-b40b-5931821bcc62",
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"metadata": {
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"tags": []
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},
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"source": [
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"### Exercise 2: Ice cream bowl 🌶️🌶️"
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]
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},
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{
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"cell_type": "markdown",
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"id": "7f366029-6fa1-48f9-95ee-578b02addecd",
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"metadata": {},
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"source": [
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"Create a class `Bowl` that can hold many ice cream scoops, as many as you like. You *should use* the custom class you created in the previous exercise.\n",
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"\n",
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"The `Bowl` class should have a method called `add_scoops()` that accepts **variable number** of scoops.\n",
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"\n",
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"<div class=\"alert alert-block alert-info\">\n",
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" <h4><b>Hint</b></h4>\n",
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" In the <code>__init__</code> method of the <code>Bowl</code> class, you should define an attribute that acts as a container to hold the scoops you might want to add.\n",
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"</div>\n",
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"\n",
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"<div class=\"alert alert-block alert-warning\">\n",
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" <h4><b>Question</b></h4> \n",
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" Complete the solution function such that it creates a bowl of scoops with every flavor contained in the argument <code>flavors</code>. The output of this function should be a <strong>string</strong> that reports the content of the bowl you just created.\n",
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"</div>\n",
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"\n",
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"For example:\n",
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"\n",
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"```\n",
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"Ice cream bowl with chocolate, vanilla, stracciatella scoops\n",
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"```"
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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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"id": "0a634345-9799-4d1d-967b-9634c5672e5f",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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" \n",
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"def solution_ice_cream_bowl(flavors: tuple[str]) -> str:\n",
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"\n",
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" class Bowl:\n",
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" \"\"\"A class representing a bowl of ice cream scoops\"\"\"\n",
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" # Write your class implementation here\n",
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"\n",
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"def solution_ice_cream_scoop(flavors: tuple[str]) -> list[str]:\n",
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" # Write your solution here\n",
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" pass"
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]
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"id": "72254316-200d-4a6d-bf93-d669f041c08b",
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"metadata": {},
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"source": [
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"That's because our `Rectangle` class automatically return `False` if we try to compare for equality an instance of `Rectangle` and any other Python object"
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"That's because our `Rectangle` class automatically returns `False` if we try to compare for equality an instance of `Rectangle` and any other Python object."
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]
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},
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{
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},
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{
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"cell_type": "markdown",
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"id": "4abfe0ba-c893-4ffd-b40b-5931821bcc62",
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"metadata": {
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"tags": []
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},
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"id": "af6a4710",
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"metadata": {},
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"source": [
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"### Exercise 2: Ice cream bowl 🌶️🌶️"
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"### Exercise 3: Ice cream shop 🌶️🌶️🌶️"
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]
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},
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{
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"cell_type": "markdown",
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"id": "7f366029-6fa1-48f9-95ee-578b02addecd",
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"id": "883794ff",
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"metadata": {},
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"source": [
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"Create a class `Bowl` that can hold many ice cream scoops, as many as you like. You *should use* the custom class you created in the previous exercise.\n",
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"Create a class `Shop` that sells many ice cream flavours. \n",
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"\n",
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"The `Bowl` class should have a method called `add_scoops()` that accept **variable number** of scoops.\n",
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"The `Shop` class should implement the comparison methods `__eq__`, `__lt__`, `__le__`.\n",
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"\n",
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"<div class=\"alert alert-block alert-info\">\n",
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" <h4><b>Hint</b></h4>\n",
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" In the <code>__init__</code> method of the <code>Bowl</code> class, you should define an attribute that acts as a container to hold the scoops you might want to add\n",
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" <h4><b>Hints</b></h4>\n",
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" <ul>\n",
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" <li>In the <code>__init__</code> method of the <code>Shop</code> class, you should define an attribute that acts as a container to hold the available flavours.</li>\n",
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" <li>You can use <code>__eq__</code> and <code>__lt__</code> to define <code>__le__</code>.</li>\n",
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" </ul>\n",
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"</div>\n",
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"\n",
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"<div class=\"alert alert-block alert-warning\">\n",
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" <h4><b>Question</b></h4> \n",
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" Complete the solution function that creates a bowl of three scoops with flavors chocolate, vanilla, and stracciatella. The output of this function should be a <strong>string</strong> that reports the content of the bowl just created.\n",
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"</div>\n",
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"\n",
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"For example:\n",
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"\n",
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"```\n",
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"Ice cream bowl with chocolate, vanilla, stracciatella scoops\n",
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"```"
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" Complete the solution function so that it creates two ice cream shops. <code>Shop 1</code> should sell the flavors provided by the parameter <code>flavor_1</code> and <code>Shop 2</code> should sell the flavors provided by the parameter <code>flavor_2</code>. The output of this function should be a <strong>boolean value</strong>: Does <code>Shop 1</code> sell <strong>fewer or the same</strong> number of flavors as <code>Shop 2</code>?\n",
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"</div>"
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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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"id": "0a634345-9799-4d1d-967b-9634c5672e5f",
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"metadata": {
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"tags": []
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},
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"id": "2f203841",
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"metadata": {},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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"class Bowl:\n",
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" \"\"\"A class representing a bowl of ice cream scoops\"\"\"\n",
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" # Write your class implementation here\n",
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"\n",
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"def solution_ice_cream_shop(flavors_1: list[str], flavors_2: list[str]) -> bool:\n",
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"\n",
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" class Shop:\n",
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" \"\"\"A class representing an ice cream shop\"\"\"\n",
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" # Write your class implementation here\n",
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"\n",
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"flavors = # TODO: create a tuple containing the flavors\n",
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" \n",
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"def solution_ice_cream_bowl(flavors: tuple[str]) -> str:\n",
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" # Write your solution here\n",
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" pass"
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]
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"---"
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]
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},
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{
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"cell_type": "markdown",
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"id": "027ae22c",
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"metadata": {},
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"source": [
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"## Quiz\n",
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"\n",
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"Run the following cell to test your knowledge with a small quiz."
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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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"id": "da20c27f",
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"metadata": {},
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"outputs": [],
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"source": [
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"from tutorial import object_oriented_programming as oop\n",
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"\n",
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"oop.OopQuiz()"
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]
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},
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{
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"cell_type": "markdown",
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"id": "419b5378-ff17-4ed3-8203-97c132918cb7",
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"metadata": {
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"tags": []
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},
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"source": [
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"## Exercise 3: Intcode computer 🌶️🌶️🌶️"
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"## Exercise 4: Intcode computer 🌶️🌶️🌶️🌶️\n",
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"\n",
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"<div class=\"alert alert-block alert-danger\">\n",
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" <h4><b>Note</b></h4>\n",
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" This is a recap exercise of intermediate difficulty.\n",
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" If you <strong>never</strong> used classes or objects before, please try to solve and understand the previous exercises first.\n",
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"</div>"
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]
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{
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},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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"class Computer:\n",
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" \"\"\"An Intcode computer class\"\"\"\n",
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" # Write your class implementation here\n",
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"\n",
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" \n",
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"%%ipytest \n",
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"def solution_intcode_computer(intcode: str) -> int:\n",
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" class Computer:\n",
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" \"\"\"An Intcode computer class\"\"\"\n",
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" # Write your class implementation here\n",
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"\n",
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" # Write your solution function here\n",
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" pass"
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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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"id": "d107aab6-4225-4407-8613-19d74407c41a",
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"metadata": {},
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"outputs": [],
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"source": []
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}
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"metadata": {
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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": "3.10.14"
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"version": "3.10.13"
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}
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},
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"nbformat": 4,

‎tutorial/object_oriented_programming.py

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from .common import Question, Quiz
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class OopQuiz(Quiz):
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def __init__(self, title=""):
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q1 = Question(
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question="Based on what you learned about Python's special methods, which of the following statements is <strong>true</strong>?",
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options={
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"__repr__ is also used for __str__, but not vice versa.": "Correct! This statement is true.",
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"__str__ is also used for __repr__, but not vice versa.": "The opposite is true.",
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"__repr__ and __str__ are completely independent.": "__repr__ is also used for __str__, but not vice versa.",
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},
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correct_answer="__repr__ is also used for __str__, but not vice versa.",
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hint="",
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shuffle=True,
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)
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q2 = Question(
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question="Based on what you learned about Python's comparison methods, which of the following statements is <strong>false</strong>?",
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options={
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"If we implement __gt__, Python will also use it for __lt__": "This statement is true.",
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"If we implement __lt__, Python will also use it for __le__": "Correct! This statement is false.",
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"If we implement __eq__, Python will also use it for __ne__": "This statement is true.",
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},
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correct_answer="If we implement __lt__, Python will also use it for __le__",
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hint="",
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shuffle=True,
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)
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q3 = Question(
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question="Based on what you learned about the @property keyword, which of the following statements is <strong>false</strong>?",
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options={
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"@property creates attributes that act like methods but can be accessed and assigned as regular attributes.": "This statement is true.",
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"@property helps implement attributes that require additional logic or validation when getting or setting their values.": "This statement is true.",
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"@property makes code more readable but restricts dynamic attibute behaviour.": "Correct! This statement is false.",
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},
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correct_answer="@property makes code more readable but restricts dynamic attibute behaviour.",
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hint="",
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shuffle=True,
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)
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super().__init__(questions=[q1, q2, q3])

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