add new stretch task

Author: l

sprint-5-stretch/README.md

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+# Sprint 5 Stretch - Radio Control App
+
+This is part of an app that can be used to control an online radio station
+
+Your task is to:
+1. Upgrade everything use dataclasses
+1. Observe how the given `__str__` method works, and add one to the other classes
+1. When the `__str__` method is called, have it print the duration in formatted mm:ss rather than just seconds
+1. Add a new class of `Person` - you can use your imagination what this includes, but it should have at least a string name
+1. Turn the fields for _artists_, _host_, and _guest_ into `Person` classes
+1. Make a new class `Podcast` that _extends_ the `TalkShow` class, with an extra string field for _sponsor_
+1. Finish implementing the class `Playlist`, and set it to takes a generic, e.g. either `Song` or `TalkShow` or `Podcast`
+
+As you implement, make sure to keep checking with mypy and add your own code at the end to test it works correctly

sprint-5-stretch/requirements.txt

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+mypy

sprint-5-stretch/stretch-radio.py

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+class Song:
+	def __init__(self, artist, duration, title):
+		self.artist = artist # should be a string
+		self.duration = duration # should be an integer in seconds
+		self.title = title # should be a string
+
+	def __str__(self):
+		return f"{self.artist} - {self.title} ({self.duration})"
+
+class TalkShow:
+	def __init__(self, host, guests, duration, title):
+		self.host = host # should be a string
+		self.guests = guests # should be a list of strings
+		self.duration = duration # should be an integer in seconds
+		self.title = title # should be a string
+
+class Playlist:
+	def __init__(self, items):
+		self.items = items # A list of Song or TalkShow
+		self.currently_playing_index = 0
+
+	def play_next(self):
+		pass
+		# TODO: increment the currently_playing_index, when you get to the end loop back to 0
+
+	def get_currently_playing(self):
+		return "todo"
+		# TODO: return a string representation of whatever is playing at the current index
+		# See the __str__ method in Song for an example of how to make a string representation of a class
+
+	def get_total_duration(self):
+		return 0
+		# TODO: return
+
+song_a = Song("Rick Astley", 210, "Never Gonna Give You Up")
+print(song_a)
+
+song_b = Song("Psy", 219, "Gangnam Style")
+funny_songs = Playlist([song_a, song_b])
+print(funny_songs.get_currently_playing())
+
+show_a = TalkShow("Melvyn Bragg", ["Jim Al-Khalili", "Sheila Rowan", "Carolin Crawford"], 2700, "Gravitational Waves")
+