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Sunday, February 16, 2020

Python Inheritance

1 - Concept of inheritance and parent class

To avoid copying the code of a class, we use the inheritance method. The inheritance method consists in creating from a parent class or (mother class) another class called daughter class or (child class) which inherits all the methods and properties of the mother class. To simplify the acquisition for beginners, we will treat this concept on simple examples:

2 - Examples of inheritance in Python Mother class:

class Person:
      def __init __ (self, name, age):
          self.name = name
          self.age = age
We have just defined a Person class whose attributes are name and age. We are now going to create a child class named Student which inherits the same methods and properties from the Mother person class. The general inheritance syntax is done using the command:
class child_class(parent_class)
Which means that the class classe_child inherits from the called parent_class

3 - Concrete example: Student child class which inherits from the Parent Person class

class Student (Person):
The inheritance of the name and age attributes is done via the command:
Person.__ init __ (self, name, age)
Student child class code:
class Student(Person):
     # definition of attributes
     def __init__ (self, name, age, sector):
          # inheritance of attributes from the parent class Person
          Person.__init__(self, name, age)
          # addition of a new file attribute to the child class
          self.sector = sector
A complet Example:
class Person:
     def __init__(self, name, age):
          self.name = name
          self.age = age
class Student(Person):
     # definition of attributes
     def __init__ (self, name, age, sector):
          # inheritance of attributes from the parent class Person
          Person.__init__(self, name, age)
          # addition of a new file attribute to the child class
          self.sector = sector
exampleStudent = Student("Albert" , 25 , "mathematics")
print("Student name is  : " , exampleStudent.name)
print("Student age is  : " , exampleStudent.age)
print("Student sector is  : " , exampleStudent.sector)
This will display after execution:
Student name is : Albert 
Student age is : 25 
Student sector is : mathematics 
 
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