My first game! also first class (useful class). I'll put similar functions onto my roguelike game later.

apple_picker.py

class Inventory():

    #attributes
    capasity = 10
    stack = []

    #methods
    
    def addItem(self,item):

        if len(self.stack) == self.capasity:
            print("My stack is full.. gotta get a bigger one.")
        else:
            self.stack.append(item)

    def removeItem(self,item):

        if len(self.stack) == 0:
            print("My stack is already empty. Nothing to remove..")
        else:
            self.stack.remove(item)
             
    def showInventory(self):

        for i in self.stack:
            print(i)

while True:
    bag = Inventory()

    command = input()

    if command == "pick":
        bag.addItem("apple")

    elif command == "remove":
        bag.removeItem("apple")

    elif command == "show":
        bag.showInventory()