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Abstract Classes: Abstract Base Classes (ABCs), abstract method, enforcing method implementation

  1. Write a Python program to create an abstract class using `ABC` and `abstractmethod` ?
  2. Write a Python program to enforce method implementation using an abstract class ?
  3. Write a Python program to calculate rectangle area using an abstract class ?
  4. Write a Python program to calculate circle area using an abstract class ?
  5. Write a Python program to demonstrate that abstract classes cannot be instantiated directly ?
  6. Write a Python program to create an abstract class for payment methods ?
  7. Write a Python program to create an abstract class for employee salary calculation ?
  8. Write a Python program to create an abstract class for student result calculation ?
  9. Write a Python program to create an abstract class for login authentication ?
  10. Write a Python program to create an abstract class for bank account operations ?
  11. Write a Python program to create an abstract class with multiple abstract methods ?
  12. Write a Python program to create an abstract class for transport fare calculation ?
  13. Write a Python program to create an abstract class for product discount calculation ?
  14. Write a Python program to create an abstract class for file operations ?
  15. Write a Python program to create an abstract class for hospital billing ?
  16. Write a Python program to create an abstract class for course fee calculation ?
  17. Write a Python program to create an abstract class for tax calculation ?
  18. Write a Python program to create an abstract class for library fine calculation ?
  19. Write a Python program to create an abstract class for different notification services ?
  20. Write a Python program to develop a payment processing system using abstract classes and enforced method implementation ?
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