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Python - Inheritance

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• Python - Inheritance
  • Inheritance
  • Method
  • Example: Inheritance

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Inheritance

• Inheritance allows us to define a class that inherits all the methods and properties from another class.

  • Parent class / Base Class: the class being inherited from, also called base class.

  • Child class / Derived Class: the class that inherits from another class, also called derived class.

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Method

• __init__()

  • the child class will no longer inherit the parent’s __init__() function
  • The child’s __init__() function overrides the inheritance of the parent’s __init__() function.

• super()

  • reference the parent class to access the parent class’s methods and properties.
  • super() function returns an object that represents the parent class.

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Example: Inheritance

print("\n--------Class: Inheritance--------\n")


class Person:
    def __init__(self, fname, lname):
        self.fname = fname
        self.lname = lname

    def __str__(self):
        return f'{self.fname} {self.lname}'

    def printName(self):
        print(f"Name: {self.fname} {self.lname}")


# inherit Person Class


class Student(Person):
    def __init__(self, fname, lname, id):
        super().__init__(fname, lname)
        self.id = id

    def __str__(self):
        return f"{super().__str__()} - {self.id}"

    def printID(self):
        print(f'ID: {self.id}')


std = Student("John", "Wick", "001")

print(std)                  # John Wick - 001
std.printName()             # Name: John Wick
std.printID()               # ID: 001

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