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In-Depth Python OOP

Challenge: Users Representation and Comparison

There are many magic methods in Python, we have not considered all of them, but others are not used as often.

Let's go back to your code. Your User class hasn't representation, and you can't print user info using the print(user) construction. Also, there are moments when you need to check a username or user id with the user instance (account) that did actions in your application.

Note

  • The comments The new code is below and The new code is above will help you to find a new code for editing.
  • In addition, you need to add class attributes to the existing code.

Task

  1. Create a role class attribute with the value "User" inside the User class.
  2. Create a role class attribute with the value "Admin" inside the Admin class.
  3. Define the representation magic method inside the User class. This method should return the string "{role}: {username}".
    For example ("Admin: greatest.admin").
  4. Define the comparison magic method for the == operation. This method should compare:
    • if the taken data is a User instance - compare the instance username and the taken instance username.
    • if the taken data is a string - compare the instance username and the taken string.
    • if the taken data has another data type - method should return False.

Everything was clear?

Section 5. Chapter 5
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course content

Course Content

In-Depth Python OOP

In-Depth Python OOP

1. OOP Concepts

What is Object-Oriented Programming?ClassAttributesInitializationChallenge: UserselfMethodsChallenge: User Auth

2. Inheritance

What is Inheritance?Challenge: AdminMultiple InheritanceMethod Resolution OrderSuperclassUseful Functions

3. Encapsulation

What is Encapsulation?PublicProtectedPrivateChallenge: Protected PasswordProperties@property@property.setterChallenge: Password Validation

4. Polymorphism and Abstraction

What is Polymorphism?MixinsChallenge: AuthMixinWhat is Abstraction?Abstract ClassAbstract MethodChallenge: AbstractAdmin

5. Magic Methods

What are magic methods?repr and strMath Magic MethodsComparison Magic MethodsChallenge: Users Representation and ComparisonSummary

Challenge: Users Representation and Comparison

There are many magic methods in Python, we have not considered all of them, but others are not used as often.

Let's go back to your code. Your User class hasn't representation, and you can't print user info using the print(user) construction. Also, there are moments when you need to check a username or user id with the user instance (account) that did actions in your application.

Note

  • The comments The new code is below and The new code is above will help you to find a new code for editing.
  • In addition, you need to add class attributes to the existing code.

Task

  1. Create a role class attribute with the value "User" inside the User class.
  2. Create a role class attribute with the value "Admin" inside the Admin class.
  3. Define the representation magic method inside the User class. This method should return the string "{role}: {username}".
    For example ("Admin: greatest.admin").
  4. Define the comparison magic method for the == operation. This method should compare:
    • if the taken data is a User instance - compare the instance username and the taken instance username.
    • if the taken data is a string - compare the instance username and the taken string.
    • if the taken data has another data type - method should return False.

Everything was clear?

Section 5. Chapter 5
toggle bottom row
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