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1. Create Class & Object2. Instance vs Class Variables3. Constructors in Python Classes4. Single Inheritance5. Multiple Inheritance6. Multilevel Inheritance7. Polymorphism with Methods8. Method Overloading Simulation9. Encapsulation with Getters/Setters10. Abstraction with ABC11. Operator Overloading12. Custom Iterator13. Class Methods14. Static Methods15. Composition Example16. Aggregation Example17. Private Variables18. Magic Methods Overview19. Object Cloning20. Custom Exceptions21. Class Decorator22. Prototype Pattern23. Singleton Pattern24. MRO (Method Resolution Order) Demo25. Polymorphism (Duck Typing)

Class Methods in Python

Use @classmethod to create alternative constructors.

IntermediateObject-Oriented ProgramsExample 13 of 25
class-methods.py
1# Program to demonstrate class methods
2

3class Employee:
4    def __init__(self, name, salary):
5        self.name = name
6        self.salary = salary
7

8    @classmethod
9    def from_string(cls, data):
10        name, salary = data.split("-")
11        return cls(name, float(salary))
12

13e = Employee.from_string("Alice-75000")
14print(e.name, e.salary)

Output

Alice 75000.0

What's going on

The class method 'from_string' constructs Employee objects from a string representation.

After this program

If the idea is still fuzzy, read Day 11: Classes and Objects in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 25 object-oriented programs, or see every topic on Python exercises.

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