Concept of Composition
Composition is a type of Aggregation in which two entities are extremely reliant on one another.
- It indicates a relationship component.
- Both entities are dependent on each other in composition.
- The composed object cannot exist without the other entity when there is a composition between two entities.
Python3
# Code to demonstrate Composition # Class Salary in which we are # declaring a public method annual salary class Salary: def __init__(self, pay, bonus): self.pay = pay self.bonus = bonus def annual_salary(self): return (self.pay*12)+self.bonus # Class EmployeeOne which does not # inherit the class Salary yet we will # use the method annual salary using # Composition class EmployeeOne: def __init__(self, name, age, pay, bonus): self.name = name self.age = age # Making an object in which we are # calling the Salary class # with proper arguments. self.obj_salary = Salary(pay, bonus) # composition # Method which calculates the total salary # with the help of annual_salary() method # declared in the Salary class def total_sal(self): return self.obj_salary.annual_salary() # Making an object of the class EmployeeOne # and providing necessary arguments emp = EmployeeOne('Geek', 25, 10000, 1500) # calling the total_sal method using # the emp object print(emp.total_sal()) |
Output:
121500
Now as we can see in the above code we have successfully called the method of a completely different class inside another class that does not inherit the class using the concept of Composition.
Python OOPS – Aggregation and Composition
In this article, we will compare and highlight the features of aggregation and Composition in Python OOPS.
Contact Us