RPG : Inventory System

When I was learning Python, I tried to do it by some different ways, the best way I found was trough making a Text-RPG, it was very funny and I've learned a lot!

The most difficult part was the inventory, Jesus it was Hard! Now I'm a little more experienced than I was and I'm leaving this for the newcomers, hope it helps!

Now let's go to the explanation!

The Classes

I've created two classes for this one, Inventory and Item (because you need to have something to put in your inventory, lol).

You can create the inventory as a dict() but I (personally) find it not effective! It's better to have functions inside it, I like to imagine the inventory as a Backpack, you can imagine the player interacting with it, and you can name (and function) the actions that the player makes with a backpack. drop_item() is a good example, you can imagine the player openning his backpack and thinking "What is dead weight here?".

Classes let you do almost exactly that! haha!

class Inventory:
    
    # The Class Constructor
    # This one is very basic, it just declares how many items you can fit 
    # in your inventory and creates an Empty list to keep them!
    def __init__(self, capacity):
        self.capacity = capacity
        self.items = []
        
class Item:

    # The Class Constructor
    # Creates a basic item, more attrs can be added for more complexity!
    def __init__(self, name, description, amount, individual_value):
        self.name = name
        self.description = description
        self.amount = amount
        self.individual_value = individual_value
    
    # Property that shows the worth of the item (x amount).
    @property
    def worth(self):
        return f'${self.amount * self.individual_value:.2f}'

We need to see those items somehow, so I've created the class show() inside the Inventory().

    # It iterates trough the list of items showing the index no., the amount and the item name.
    def show(self):
        index = 1
        for item in self.items:
            print(str(f'{index} -> [x{item.amount}] {item.name}'))
            index += 1

Handling Items

I've created a function drop_item() that shows you your items and asks you which one do you want to drop.

def drop_item(self):
        print('\nWhich item do you want to drop? ["0" to Quit]')
        self.show()
        
        # Accepts user input to reference the index. If the Number is 0, quits the program (can be changed of course).
        i = int(input('\nNº > '))
        if i == 0:
            print('\nClosing the Inventory...')
            quit()
        
        # References the item with -1 (Python indexes start with 0).
        item = self.items[i - 1]
        if item.amount == 1:
            amt = 1
            self.items.pop(i - 1)
            print(f'Item {item.name}[x{amt}] Dropped!\nNow your Inventory is this:')

        else:
            print(f'You have {item.amount} of this, how many do you want to drop?')
            amt = int(input('amt > '))
            if item.amount <= 0:
                amt = 0
                self.items.pop(item)
                print(f'Item {item.name}[x{amt}] Dropped!\nNow your Inventory is this:')
            item.amount -= amt
            print(f'Item {item.name}[x{amt}] Dropped!\nNow your Inventory is this:')

        self.show()
        
        # Recursion (Can be Removed)
        self.drop_item()

It haves an example of how to sell items, that is shown inside the Item Class.

    def sell(self):
        if self.amount >= 1:
            print('How many do you want to sell?')
            amt = int(input('amt > '))
            print(f'Are you sure you want to sell {self.amount} {self.name} for ${self.individual_value * amt:.2f}?')
            confirm = input('[y/n] > ')
            if confirm == 'y':
                self.amount -= amt
                print(f'{amt} {self.name} sold for ${amt * self.individual_value:.2f}!')

And for check the total worth of your richness in Items, I've created a property inside the Inventory named total_worth.

    # It uses a list comprehension inside a sum() function inside a formatted string (That's why I love Python).
    @property
    def total_worth(self):
        return f'\nThe inventory Total Worth is: ${sum([i.individual_value * i.amount for i in self.items]):.2f}'

I Really hope it Helps newcomers, I can say that learning by making little games made that initial bad from learning something "complex" and new, a good thing!

If you want more content about Text RPG's plase email: ngj.netrunner@gmail.com!

Happy Coding!

by @ngeorgj at 16/08/2020 made during the pandemic.