🎮 MINI PROJECT: Ultimate Roblox Catalog Shop 🏪

Build a complete Roblox shop where you can buy AND sell items repeatedly!

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Step 1: Setup 🎯

Create these variables:

catalog = {
    "Dominus": 50000,
    "Sparkle Time Fedora": 15000,
    "Valkyrie Helm": 25000,
    "Rainbow Wings": 8000,
    "Golden Crown": 12000,
    "Bloxy Cola": 500
}
inventory = {}
items_bought = 0
items_sold = 0

• Ask user with input: "How much Robux do you have? "
• Convert to integer and store in robux

Expected Output:

How much Robux do you have? 30000

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Step 2: Display Shop Menu 📋

Create a function or section that prints:

=== ROBLOX CATALOG SHOP ===
[List all catalog items and prices]
Your Robux: [robux]
Your Inventory: [inventory]
Items Bought: [items_bought]
Items Sold: [items_sold]

Expected Output:

=== ROBLOX CATALOG SHOP ===
Dominus: 50000 Robux
Sparkle Time Fedora: 15000 Robux
Valkyrie Helm: 25000 Robux
Rainbow Wings: 8000 Robux
Golden Crown: 12000 Robux
Bloxy Cola: 500 Robux

Your Robux: 30000
Your Inventory: {}
Items Bought: 0
Items Sold: 0

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Step 3: Main Action Loop 🔄

Create a while True: loop that:

• Asks: "What do you want to do? (buy/sell/quit): "
• Stores answer in variable action

Expected Output:

What do you want to do? (buy/sell/quit): 

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Step 4: Buy Action 🛒

Inside the loop, add:

if action == "buy":

• Ask: "What item do you want to buy? "
• Check if item exists in catalog
• Check if player has enough Robux
• If both true:
  • Subtract price from robux
  • Add item to inventory with its price
  • Increment items_bought by 1
  • Print success message
• Handle errors (not enough robux, item doesn't exist)
• Show updated robux and inventory

Expected Output (Success):

What item do you want to buy? Valkyrie Helm
You bought Valkyrie Helm for 25000 Robux!
You now have 5000 Robux
Your Inventory: {'Valkyrie Helm': 25000}
Items Bought: 1

Expected Output (Not Enough Robux):

What item do you want to buy? Dominus
Not enough Robux! Dominus costs 50000 Robux

Expected Output (Item Doesn't Exist):

What item do you want to buy? Ninja Sword
Item not found in catalog!

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Step 5: Sell Action 💰

Inside the loop, add:

elif action == "sell":

• Ask: "What item do you want to sell? "
• Check if item exists in inventory
• If yes:
  • Calculate sell price (50% of original value)
  • Add sell_price to robux
  • Remove item from inventory using del
  • Increment items_sold by 1
  • Print success message
• If item not in inventory, print error
• Show updated robux and inventory

Expected Output (Success):

What item do you want to sell? Bloxy Cola
You sold Bloxy Cola for 250 Robux!
You now have 4750 Robux
Your Inventory: {'Valkyrie Helm': 25000}
Items Sold: 1

Expected Output (Item Not in Inventory):

What item do you want to sell? Rainbow Wings
You don't own that item!

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Step 6: Quit Action 🚪

Inside the loop, add:

elif action == "quit":

• Print final Robux amount
• Print final inventory
• Print total items bought and sold
• Use break to exit the loop

Expected Output:

Final Robux: 4750
Final Inventory: {'Valkyrie Helm': 25000}
Total Items Bought: 2
Total Items Sold: 1
Thanks for shopping!

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Step 7: Invalid Action ⚠️

Add an else: statement:

• Print "Invalid action! Please type buy, sell, or quit"

Expected Output:

What do you want to do? (buy/sell/quit): trade
Invalid action! Please type buy, sell, or quit

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Complete Example Output: 📺

How much Robux do you have? 30000

=== ROBLOX CATALOG SHOP ===
Dominus: 50000 Robux
Sparkle Time Fedora: 15000 Robux
Valkyrie Helm: 25000 Robux
Rainbow Wings: 8000 Robux
Golden Crown: 12000 Robux
Bloxy Cola: 500 Robux

Your Robux: 30000
Your Inventory: {}
Items Bought: 0
Items Sold: 0

What do you want to do? (buy/sell/quit): buy
What item do you want to buy? Valkyrie Helm
You bought Valkyrie Helm for 25000 Robux!
You now have 5000 Robux
Your Inventory: {'Valkyrie Helm': 25000}
Items Bought: 1

What do you want to do? (buy/sell/quit): buy
What item do you want to buy? Bloxy Cola
You bought Bloxy Cola for 500 Robux!
You now have 4500 Robux
Your Inventory: {'Valkyrie Helm': 25000, 'Bloxy Cola': 500}
Items Bought: 2

What do you want to do? (buy/sell/quit): sell
What item do you want to sell? Bloxy Cola
You sold Bloxy Cola for 250 Robux!
You now have 4750 Robux
Your Inventory: {'Valkyrie Helm': 25000}
Items Sold: 1

What do you want to do? (buy/sell/quit): buy
What item do you want to buy? Dominus
Not enough Robux! Dominus costs 50000 Robux

What do you want to do? (buy/sell/quit): trade
Invalid action! Please type buy, sell, or quit

What do you want to do? (buy/sell/quit): quit
Final Robux: 4750
Final Inventory: {'Valkyrie Helm': 25000}
Total Items Bought: 2
Total Items Sold: 1
Thanks for shopping!

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💡 Tips for the Mini Project:

• Use while True: for infinite loop
• Use break to exit the loop
• Access dict values: catalog[item]
• Add to dict: inventory[item] = price
• Remove from dict: del inventory[item]
• Check if key exists: if item in catalog:
• Integer division for 50%: price // 2
• Increment counters: items_bought += 1

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🌟 Bonus Challenges:

1. Add more items to the catalog
2. Make selling give 75% back instead of 50%
3. Add a "view" action to see catalog without buying
4. Add special "limited" items that increase in price after purchase