Ground Gurus - Python Code Camp - Day 3 - Classes
- 1. Advance Python Day 3 CHA PLADIN cpladin@ibex.co | cpladin@ama.edu
- 3. QUICK RECAP ● Python Fundamentals ● Operations ● Data Types ● Lists ● Built-in Function and Methods ● File Built-in Functions ● Loop constructs ● Functions
- 4. ACTIVITY - OLD SCHOOLYARD PICK Write a program that will ask the user for 5 names. Using string manipulations, trim each name which separates the first name with the last name and store the trimmed strings to two lists fname and lname respectively.
- 5. Class A user-defined prototype for an object that defines a set of attributes that characterize any object of the class. The attributes are data members (class variables and instance variables) and methods, accessed via dot notation.
- 6. Class
- 7. __init__() Function This function is automatically called every time the class is being used to create a new object.
- 9. Methods All functions that belongs to a class.
- 10. Methods
- 11. self parameter self parameter is a reference to the class itself, and is used to access variables that belongs to the class.
- 12. self parameter(cont.) self parameter is not limited to ‘self’ keyword. Any keyword* would work guided that it has to be the first parameter of the __init__ method.
- 14. Instead of using keyword ‘self’, modify our Person class by replacing self by other keywords and test if code will still work. Test it out
- 15. Class variables vs Instance variables Class variable is a variable that is shared by all instances of a class. Class variables are defined within a class but outside any of the class's methods while Instance variable is a variable that is defined inside a method and belongs only to the current instance of a class.
- 16. Creating Instance Objects To create instances of a class, you call the class using class name and pass in whatever arguments its __init__ method accepts.
- 17. Accessing attributes You access the object's attributes using the dot operator with object.
- 18. ACTIVITY - BREAK A LEG Create a class named Animal having a animal name, animal color and legs_count. In the same class, create a method called identify_animal in which you will determine if an animals is either 2-legged, 4 -legged or limbless or no legs. If legs_count = 8, it should print out “arthropods” If legs_count = 4, it should print out “quadruped” If legs_count = 2, it should print out “biped” If legs_count = 0, it should print out “apoda” For other values for legs_count = it should print out “Odd creature”
- 19. ACTIVITY - BREAK A LEG Sample Output
- 20. Inheritance creating a class by deriving it from a preexisting class by listing the parent class in parentheses after the new class name.
- 21. Inheritance Advance Python - Day 3
- 22. Activity - Super Idol Create a parent class called Worker which has instance variables such as name, email_address and class variable basic_pay. Create a subclass CEO which will inherit the name, email_address and class variable basic_pay. Do a validation check in your child method that if the inherited value of basic pay is less than 15,000, you should add 5,000 to the basic pay.
- 23. Polymorphism Different object forms accessing the same method on both classes.