list - [Python ]Using variables defined inside a class (before __init__) in its own methods (__init__, etc.) -

i'm trying make basket can put fruit. basket class, called basket, has internal list called contents. every time basket fruit instance created, it's self.name property appended contents. anyhow, doesn't work.

contents = []  class basket:  ## want define list "contents", ## doesn't work.      def __init__(self,name):         self.name = name         global contents         if name not in contents:             contents.append(name) 

for reason, works if define list contents outside class altogether, affect order , debugging in bigger projects.

is there way make code work, lets me define list inside class? if make class-specific "global"variable, valid methods/variables inside class.

note: class supposed 1 basket! each fruit called basket itself, fruit. want them inside 1 basket.

this whole answer lengthy explanation why shouldn't doing you're trying do...

"note: class supposed 1 basket! each fruit called basket itself, fruit. want them inside 1 basket."

before making attempt solve riddle, actual question must put in perspective.

• you're dealing 2 nouns - fruit , basket
• they have associative relationship: independent, related.

"each fruit called basket"

capital mistake! chessboard , chess pieces. 1 cannot other.

"i want them inside 1 basket."

if "all" meant "all fruits", done.

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to put things in perspective, first modify class names follows:

class fruit(object):     def __init__(self, name):         self.name = name 

now there must object called basket keep track of fruits. doesn't have class. can make dictionary, set, list or other container.

basket = set() 

is simple set can hold fruits. each time when make fruit, can automatically add name basket:

basket = set()   class fruit(object):     def __init__(self, name):         self.name = name         # needed!         basket.add(name) 

to test code:

# making fruits name in ["apple", "orange", "banana"]:     fruit(name)  # checking basket print(basket) 

the output follows:

{'banana', 'apple', 'orange'} 

now, if want add more functionality basket object, can make in class follows:

class basket(object):     def __init__(self, fruits=none):         self.fruits = fruits or set()      def put(self, fruit):         """add fruit basket."""         self.fruits.add(fruit)      def show(self):         """display fruits in basket."""         fruit in self.fruits:             print(fruit.name)    class fruit(object):     def __init__(self, name, basket=none):         self.name = name          # adding basket if needed.         if basket not none:             basket.put(self)    # making 2 baskets gift = basket() picnic = basket()  # making fruits , adding them both baskets apple = fruit("apple", basket=gift) orange = fruit("orange", basket=picnic) banana = fruit("banana", basket=gift)  print("in gift basket have:") gift.show() print("in picnic basket have:") picnic.show() 

and output:

in gift basket have: banana apple in picnic basket have: orange