🔒 classes

[karmic plover]

how to i access a variable i made inside a method of a class on a different method of the same class?
i.e

def class(x, y, z)
...
...
def ice(self):
  variable1 = 0

def fire(self):
  return blahblah

if i wanted to access variable1 from ice in fire how would i do that?

[tough oracle]

@karmic plover

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[low spire]

it is not possible

variable1 exists only in the scope oif ice you can not access it from outside of this scope

you could make it an attribute of the instance (or the class)

or return it and call the method in the other method

[lean torrent]

You should define it as a class variable and reference it as self.variablename

Or use Sean's suggestions. Either will work

[low spire]

i mean

You should define it as a class variable and reference it as self.variablename
and
you could make it an attribute of the instance (or the class)
are the same 😂

[lean torrent]

Yes they are

But you also suggested returning the variable

[karmic plover]

i think adding as an attribute makes the most sense

whats it called when u add a uh

like static variable

@staticmethod?

i remember learning this but i forgot

a constant?

[low spire]

you did not said how you want to use the value so i wanted to tell you this possibility

[low spire]

define in in the class

class Test:
    a = 4  # static variable

[karmic plover]

im basically doing some credit card thing where i need to make a way to track everytime a charge is made and keep a tracker so that after 10 calls the customer gets a $1 penalty on their balance

[karmic plover]

so it has to go right under the class?

[low spire]

no just not in a method like __init__ but you can define some methods first and then class variables

[lofty lagoon]

But first, you need to have a "class" statement which defines this as a class - not: def class. THen there is typically an init method to set up your variables, like this:

class MyClassName:
    def __init__(self, <any other parameters>):
        # any code to initialize instance variables
        # like:  self.variable1 = 0

Then each of your methods should have 'self' as a parameter.

Then you can refer to any instance variables in any other method using the self.variable name, like self.variable1

[low spire]

but this is the convention

[karmic plover]

well i dont need this to be a variable

[low spire]

what do you not need to be a variable?

[lean torrent]

The question is how to access a variable. So I'm confused. It is a variable.

[low spire]

for this you need a variable to count the calls

[lofty lagoon]

Assuming that you are going to create more than one credit card object, and you want to track the charges done on each card, then you would need something like this:

class CreditCard:
    def __init__(self):
        # any code to initialize instance variables
        self.charges = []  # define an empty list
        self.balance = 0 # define the total charges

Then you would probably have another method, maybe called new_charge. In that method, append the value of the new charge to the list (self.charges), and if the list now has over 10 items, then add one dollar to the balance (self.balance).

[karmic plover]

Um I think we’re using variable and attribute interchangeably

I don’t need it to be an attribute is what I meant

[karmic plover]

Yeah I did this except I made charges 0

And added the counter to the charge class

So every time charges() is called

It does self.charges += 1

Then I added a method so that if self.charges > max_charges then self.balance += 1

I think that should work…

[low spire]

what? about what are we talking?

[low spire]

this is an attribute

[karmic plover]

The max_charges

Because that’s a constant and it should never change

I guess I don’t even really need it?

I can just do self.charges > 10

[tough oracle]

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