1. Jukebox Redux!

This lab is a play off of the Jukebox Lab – though don’t worry, you don’t need to complete the Jukebox Lab to do this lab!

The first part of this lab is to simply see the working product that you’re going to create.

  1. Open main.py in Atom.
  2. Uncomment the import statements that load the solution modules. Don’t look at the solution source, though!
#  Uncomment the import statements below to view the solution's behavior.
import solution.jukebox_solution as jukebox
import solution.song_solution as song
  1. In the Terminal, run python main.py to run the working Jukebox. Try out a few commands, etc.
    • If there appears to be a bug in the behavior, tell your lead instructor :)
  2. When you’re done playing around, comment out the solution import statements again.
#  Uncomment the import statements below to view the solution's behavior.
#  import solution.jukebox_solution as jukebox
#  import solution.song_solution as song
  1. Try running python main.py again. Most of the commands should be broken. To fix it, you’ll be implementing behavior in song.py and jukebox.py

2. Objects: __init__ and __str__

main.py is a program that creates and calls methods on a single Jukebox and multiple Song objects. In other words, main.py is a “client” of Jukebox and Song. In order for main.py to work correctly, you’ll have to implement the behavior within song.py and jukebox.py.

  1. Open song.py and jukebox.py in Atom.

Note: You’ll notice the method bodies all end in pass. pass is a statement that does nothing in Python. Since indentation matters in Python, a function body cannot actually be empty. Therefore, we use pass in the methods of song.py and jukebox.py to indicate an empty, unimplemented function body. You can delete pass as soon as you’ve written any other statement in the function body.

  1. Implement __init__ and __str__ in song.py. The comments in the file will tell you the intended behavior.

Note: Remember that __init__ is a special method representing the constructor for the Song object. __str__ is another special method that will be called on a Song object whenever it is printed (or when str() is called on it)

  1. Implement __init__ and get_song_list in jukebox.py. The comments in the file will tell you the intended behavior.

  2. Test out your object by running python main.py, and try out the “View song list” command.

main.py adds two songs to the Jukebox by default, so you should see:

  1: Here Comes the Sun - The Beatles
  2: Sweet Caroline - Neil Diamond

3. Adding state to objects

  1. Implement play and times_played in song.py. The comments in the file will tell you the intended behavior.
  2. Implement play_song, current_song, and stop_current_song in jukebox.py. The comments in the file will tell you the intended behavior.
  3. Test out your object by running python main.py, and try out the “Play song”, “View current song”, “Stop current song”, and “Top 3 songs” commands.

Here’s an example of what you should see (with the menu text removed):

Enter a number: 2
Choose a song from the list:
  1: Here Comes the Sun - The Beatles
  2: Sweet Caroline - Neil Diamond
Enter a song number: 2
Playing 'Sweet Caroline - Neil Diamond'

Enter a number: 3
  Now playing: Sweet Caroline - Neil Diamond

Enter a number: 2
Choose a song from the list:
  1: Here Comes the Sun - The Beatles
  2: Sweet Caroline - Neil Diamond
Enter a song number: 1
Playing 'Here Comes the Sun - The Beatles'

Enter a number: 3
  Now playing: Here Comes the Sun - The Beatles

Enter a number: 4
  Stopped playing: Here Comes the Sun - The Beatles

Enter a number: 3
  Now playing: None

Enter a number: 2
Choose a song from the list:
  1: Here Comes the Sun - The Beatles
  2: Sweet Caroline - Neil Diamond
Enter a song number: 1
Playing 'Here Comes the Sun - The Beatles'

Enter a number: 6
  1: Here Comes the Sun - The Beatles (plays: 2)
  2: Sweet Caroline - Neil Diamond (plays: 1)

4. Creating objects and __eq__

  1. Implement __eq__ in song.py. The comments in the file will tell you the intended behavior.

Note: Like __init__ and __str__, __eq__ is another special method in Python. __eq__ gets called whenever the == operator is applied to two objects of that type.

  1. Implement add_song in jukebox.py. The comments in the file will tell you the intended behavior.
  2. Test out your object by running python main.py, and try out the “Add new song” command, then “View song list” to make sure it added.

Here’s an example of what you should see (with the menu text removed):

Enter a number: 5
Enter the song's title: Baby Love
Enter the song's artist: The Supremes
Does 'Baby Love - The Supremes' look correct? (y/n): y
'Baby Love - The Supremes' added.

Enter a number: 1
  1: Here Comes the Sun - The Beatles
  2: Sweet Caroline - Neil Diamond
  3: Baby Love - The Supremes

Enter a number: 5
Enter the song's title: Come See About Me
Enter the song's artist: The Supremes
Does 'Come See About Me - The Supremes' look correct? (y/n): y
'Come See About Me - The Supremes' added.

Enter a number: 2
Choose a song from the list:
  1: Here Comes the Sun - The Beatles
  2: Sweet Caroline - Neil Diamond
  3: Baby Love - The Supremes
  4: Come See About Me - The Supremes
Enter a song number: 4
Playing 'Come See About Me - The Supremes'

Enter a number: 5
Enter the song's title: Come See About Me
Enter the song's artist: The Supremes
Does 'Come See About Me - The Supremes' look correct? (y/n): y
'Come See About Me - The Supremes' already exists.

5. Extra Credit: Comparisons

  1. Extra Credit: Implement get_most_popular_songs in jukebox.py. The comments in the file will tell you the intended behavior.

Hint: You may want to use the sorted() function.

Here’s an example of what you should see (with the menu text removed):

Enter a number: 2
Choose a song from the list:
  1: Here Comes the Sun - The Beatles
  2: Sweet Caroline - Neil Diamond
  3: Baby Love - The Supremes
  4: Come See About Me - The Supremes
Enter a song number: 4
Playing 'Come See About Me - The Supremes'

Enter a song number: 3
Playing 'Baby Love - The Supremes'

Enter a song number: 4
Playing 'Come See About Me - The Supremes'

Enter a song number: 1
Playing 'Here Comes the Sun - The Beatles'

Enter a song number: 2
Playing 'Sweet Caroline - Neil Diamond'

Enter a number: 6
  1: Come See About Me - The Supremes (plays: 2)
  2: Here Comes the Sun - The Beatles (plays: 1)
  3: Sweet Caroline - Neil Diamond (plays: 1)