24 Questions
What is the primary purpose of encapsulation in object-oriented programming?
To restrict accessing variables and methods directly
What is the type of access modifier that allows access to variables and methods within the class and its sub-classes?
Protected
What is the function of the __init__ method in the Employee class?
To initialize object properties
What is the output of the emp.show() method?
Name: Jessa Salary: 8000
What is the advantage of using public data members in a class?
They are accessible within and outside of a class
What is the type of access modifier that restricts access to variables and methods within the class?
Private
What is the purpose of the work method in the Employee class?
To print the employee's name and project
What is the benefit of using access modifiers in object-oriented programming?
To restrict accessing variables and methods directly
What is the primary purpose of the init method in the Car class?
To assign default values to the data attributes
What is the effect of calling the accelerate method on a Car object?
It increases the speed by 5
What is the purpose of the get_speed method in the Car class?
To return the current speed of the car
What is the data attribute in the Pet class that stores the type of animal?
_animal_type
What is the purpose of the set_name method in the Pet class?
To assign a value to the _name field
What is the difference between the accelerate and brake methods in the Car class?
The accelerate method increases the speed, while the brake method decreases the speed
What is the purpose of creating a Pet object?
To store information about a pet
What is the common characteristic of the data attributes in the Car and Pet classes?
They are all instance variables
What is the primary purpose of using getter and setter methods in a class?
To add validation logic for setting a value
What is the benefit of using private variables in a class?
It restricts access to the variables and allows modification only through setter methods
What is the purpose of the init method in a class?
To define a constructor for the class
What is the benefit of using information hiding in a class?
It restricts access to the variables and allows modification only through setter methods
What is the purpose of the setter method in a class?
To set the value of a private variable with validation
What is the benefit of using getter methods in a class?
It restricts access to private variables and allows retrieval only through getter methods
What is the purpose of using private variables in a class?
To restrict access to the variables and allow modification only through setter methods
What is the benefit of using conditional logic in setter methods?
It restricts access to private variables and allows modification only through setter methods with validation
Study Notes
Programming Exercise: Car Class
- The Car class has three data attributes:
_year_model,_make, and_speed. - The
_init_method initializes the car's year model, make, and sets the speed to 0. - The
acceleratemethod adds 5 to the speed data attribute each time it is called. - The
brakemethod subtracts 5 from the speed data attribute each time it is called. - The
get_speedmethod returns the current speed of the car.
Programming Exercise: Pet Class
- The Pet class has three data attributes:
_name,_animal_type, and_age. - The
_init_method initializes the pet's name, animal type, and age. - The
set_name,set_animal_type, andset_agemethods assign values to the respective data attributes. - The
get_name,get_animal_type, andget_agemethods return the values of the respective data attributes.
Encapsulation and Abstraction
- Encapsulation restricts access to variables and methods directly and prevents accidental data modification.
- It is a way to restrict access to methods and variables from outside of a class.
- Encapsulation is useful when working with sensitive data and providing access to all variables used within the class is not a good choice.
Access Modifiers
- Python provides three types of access modifiers: public, private, and protected.
- Public members are accessible anywhere from outside the class.
- Private members are accessible within the class.
- Protected members are accessible within the class and its sub-classes.
Information Hiding and Conditional Logic
- Information hiding is used to restrict access to object attributes.
- Conditional logic is used to add validation logic for setting an object attribute.
- Private members can be used to restrict access to object attributes.
- Setter methods can be used to modify private data members with rules.
- Getter methods can be used to retrieve private data members.
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