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intro-to-oop_052223east's Introduction
pipenv install will allow us to use the ipdb library.pipenv shell will bring us to an environment with ipdb.- Once in that shell running
python run.py will bring us to a prompt where our classes are in scope.
- Define
object in programming domain
- OOP: Organize code like real objects
- Object = data + functions/methods
- Create a class and instantiate an instance of the class
- Invoking the class, e.g.
Cat()
- Saving to a variable:
c1 = Cat()
- Explain the difference between a class and an instance
- Class : Instance as Blueprint : House
- Class : Instance as Factory : Car
- Pass arguments to
__init__ by defining an dunder init method in class
- Python knows to look for the
__init__ method when an instance is created.
- e.g.
c1 = Cat( 'Luke', 5 )
- Create instance methods
- Same function syntax as with normal Python functions, only now all methods will have one parameter of
self, which represents the instance.
- Define attribute readers and writers using the
property function.
- A
property is a way to access instance attributes that involve additional logic.
- Represent the instance with another dunder method:
__repr__.
- The
__repr__ method is used when one wants to change how an instance is viewed, e.g. when passed as an argument to print
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