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Python Object-Oriented Python Instant Objects Method Interactivity

Ian Cole
Ian Cole
454 Points
Posted by Ian Cole
Ian Cole
454 Points

Hard time understanding classes

I know im doing something wrong here, most likely my syntax. But im having a super hard time wrapping my head around classes, methods, etc... Could someone help me to understand the concept? It seems kinda important.

first_class.py 
class Student:
    name = "Your Name"

    def praise(self):
        return "You inspire me, {}".format(self.name)

    def reassurance(self):
        return "Chin up, {}. You'll get it next time!".format(self.name)

    def feedback(self, grade):
        if grade > 50:
            return praise(self)
        else:
            return reassurance(self)
Jeffrey James
Jeffrey James
2,636 Points
Jeffrey James
Jeffrey James
2,636 Points

I think classes are sort of superflous when you're just learning Python. In the end, it's just a way to call a function on an object that you wanted to create from scratch. By object, I mean that using a string, list JSON object, something from a library, a dictionary, etc....was not enough to handle your problem by writing functions for.

Most of the examples you see in tutorials for Classes are contrived, so much so, that it all seems trite.

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

You are closer than you think! The class methods uses self as the first parameter to hold the reference of the current instance of the class. "self" is used to keep track of the current instance and it's not something you need to pass during a method call.

So, when feedback is called on a reference, the self contains the current instance reference. This "self" is used to determine where to find praise since it's not a global function. By using self.praise() within the feedback method, you are saying call the praise() method that can be found in the namespace of this instance. Notice there are no arguments when calling praise() since the instance reference is taken care of automatically.

Hope that helps. Post back if you have more questions. Good luck!!