inheritance_overriding.md

Lesson: Inheritance & Overriding

📝  Class Materials:

• Slides

# Superclass - Parent
class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def introduce_self(self):
        print(f"My name is {self.name} and my age is {self.age}.")


# create two people and have them introduce themselves
person_1 = Person("Adriana", "28")
person_1.introduce_self()

person_2 = Person("Braus", "32")
person_2.introduce_self()

# create Student class

class Student(Person):
    def __init__(self, name, age, major):
        super().__init__(name, age)
        self.major = major
  
    def study(self):
        print(f"{self.name} studies {self.major}")

    def introduce_self(self):
        super(Student, self).introduce_self()
        print(f"I major in {self.major}")
    
# create a Student and have them introduce themselves

student_1 = Student("Danika", "28", "Computer Science")
student_1.introduce_self()

Challenges

• Create a a Musician class that extends Person
• Muscians should have a favorite song. Musician class should have a favorite_song attribute that is initialized when an instance is created.
• A muscian should have a method called hum_tune. When this method is called you should print: "{name} hums {favorite_song}"
• When a musician introduces themself they say: "My name is {name} and my age is {age}." and "my favorite song is {favorite_song}".

Stretch Goals

1. Define an Instrument class. An Instrument has attributes: name and sound
   • Initialize an instrument with a sound
   • Instruments make a sound: "Toot", "Hmmm", "Plink", "Bom", etc. Initialize an instrument with a sound.
2. All musicians learn one or more instruments in school! Give the Muscian class an instruments attribute. This is a list.
   • Add a method add_instrument. This method takes an Instrument as an argument and adds that instrument to that muscian's instruments list.
   • Musicians can play their instrument. Give the Musican a play method. A musician will always play the first instrument in their instruments list by print the sound of the instrument a number of times: "Toot Toot", "Hmmm Hmmm Hmmm", "Plink Plink Plink" etc. Songs are in 4/4 or 3/4 or 7/4 so this method takes a second parameter that says how many times to play the sound. For example: dave.play(4) -> "Bom Bom Bom Bom"
3. Make a Band class. A band has a name, genre, and a list of members. Members is a list of musicians!
   • Give Band an add_musician method. This method takes a Musician as an argument and adds that musician to the members list.
   • Give Band an interview method. When there's an interview all band members introduce themselves.
   • Give Band a play_show method. This method plays a song. A song has a time signature so it takes a number as an argument. When a band plays a song Every band member plays their instrument and the process repeats for the time signature. For example: Band of Mick (Doo) and Kieth (Plink) plays a song in 4: "Doo Plink Doo Plink Doo Plink Doo Plink"