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207 lines
6.1 KiB
207 lines
6.1 KiB
{
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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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"### \n",
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"\n",
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"# Unit 4 Lab: Carefully Adding a Bit More Logic\n",
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"\n",
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"## Overview\n",
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"Welcome to the Unit 4 lab!\n",
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"\n",
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"Our goal is that, at the end of the next lab (you're almost there!), your app makes it possible for users to search for a movie and print out either the Rotten Tomatoes rating or the search results.\n",
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"\n",
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"Let's get a little closer. We still have hard-coded values, but in the next lab we'll actually get the real ratings. For now, let's incorporate some intermediate variables and error-catching.\n",
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"\n",
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"Solutions from the previous lab have been provided below _as a starting point_ for this lab."
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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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"#### Media Class\n",
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"\n",
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"For this exercise, this class will remain untouched."
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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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"class Media(object):\n",
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" \"\"\"Base class for Movie and Book objects\"\"\"\n",
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"\n",
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" def __init__(self, publisher, market):\n",
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" self.publisher = publisher\n",
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" self.market = market\n",
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"\n",
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" def get_media_info(self):\n",
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" \"\"\"Prints media info to stdout\"\"\"\n",
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" print(f'The Media object\\'s publisher is {self.publisher} \\\n",
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" and the market is {market}.')\n",
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" return None"
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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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"#### Movie Class\n",
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"\n",
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"Augment the functionality of the `Movie` class as follows:\n",
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"\n",
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"- Modify the `get_movie_title` and `get_movie_rating` methods to catch a KeyError if a key in the input dictionary is not found\n",
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"- Upon such a condition, print the following to stdout\n",
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"```python\n",
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"'Key <input key> was not found in dictionary.'\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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"metadata": {},
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"outputs": [],
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"source": [
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"import sys\n",
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"\n",
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"class Movie(Media):\n",
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" \"\"\"\n",
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" Movie objects contain all information about a particular movie,\n",
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" including the title and rating.\n",
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" \"\"\"\n",
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"\n",
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" def __init__(self, movie_data, publisher, market):\n",
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" \"\"\"\n",
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" Initialize Movie class, note that the init of the superclass,\n",
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" Media, is called with the super().__init__() call\n",
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" \"\"\"\n",
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" # Call the constructor (init) method of Media\n",
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" super().__init__(publisher, market)\n",
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" # Store the raw data in this object so that we can use the\n",
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" # data in the getter functions.\n",
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" self.movie_data = movie_data\n",
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"\n",
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" def get_movie_title(self):\n",
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" \"\"\"\n",
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" get_movie_title is a getter function that returns the movie title.\n",
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" \"\"\"\n",
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" # Return the title from the movie data.\n",
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" return self.movie_data[\"title\"]\n",
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"\n",
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" def get_movie_rating(self):\n",
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" \"\"\"\n",
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" get_movie_rating is a getter function that returns the rating.\n",
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" \"\"\"\n",
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" # Return the rating from the movie data.\n",
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" return self.movie_data[\"rating\"]"
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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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"#### Functions\n",
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"\n",
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"Functions below will remain untouched for this exercise"
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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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"def return_single_movie_object(movie_title, movie_rating, publisher, market):\n",
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" \"\"\"\n",
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" Take in the movie title and rating, and return the movie object.\n",
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" \"\"\"\n",
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"\n",
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" return Movie({'title': movie_title, 'rating': movie_rating}, publisher, market)\n",
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"\n",
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"def print_all_ratings(movie_list):\n",
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" \"\"\"\n",
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" Take in a list of movies, create a movie object for each, and print the rating.\n",
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" \"\"\"\n",
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"\n",
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" for movie in movie_list:\n",
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" movie_object = return_single_movie_object(movie, 4, \"Universal Studios\", \"USA\")\n",
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" print(\"The movie\", movie_object.get_movie_title(), \"has a rating of\", movie_object.get_movie_rating())"
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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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"#### Testing Pt. 1/2\n",
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"\n",
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"Write code that will:\n",
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"\n",
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"- Create a new `Movie` object with the following properties:\n",
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" - A `movie_data` dictionary with key value pairs (respectively) of:\n",
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" - `title` and `The Matrix`\n",
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" - `rating` and `10`\n",
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" - A `publisher` of `Roadshow Entertainment`\n",
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" - A `market` of `Australia`\n",
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" \n",
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" - Call the `get_movie_title` and `get_movie_rating` methods"
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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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"# A:"
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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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"#### Testing Pt. 2/2\n",
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"\n",
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"- Repeat the instantiation of the `Movie` object with an empty dictionary for the `movie_data` argument\n",
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" - Call the `get_movie_title` and `get_movie_rating` methods again\n",
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" - Does your error handling catch your KeyError event?"
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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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"# A:"
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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": "3.7.6"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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