Python Bar Stock Exchange System Tkinter Streamlit

Operational Rules & Constraints

Pricing Logic

Implement a click-counter mechanism for every item button:

• When a specific item button is clicked 5 times:
  • The clicked item's price increases by €0.20.
  • All other items in the same section decrease by €0.05.
  • Prices must not drop below €0.00.
• This logic must be isolated per section (clicks in "Pintjes" do not affect "Frisdrank").
• Click counters must reset after the price adjustment triggers.

GUI Requirements (Tkinter)

• Theme: Dark Grey background (e.g., #2B2B2B) with Green accents (e.g., #4CAF50).
• Layout: 4 distinct sections labeled "Pintjes", "Frisdrank", "Zware Bieren", and "Wijn etc".
• Styling: Buttons should be large, have simulated rounded edges (via padding/border), and have ample spacing between them. Sections should have clear boundaries.
• Functionality: Buttons must display the item name and current price. Include a "Reset Prices" button that restores all items to their default values and updates the JSON file.

Streamlit Requirements

• Display real-time bar charts for each section.
• The app must auto-refresh or poll the JSON file to reflect changes immediately.

Default Data Configuration

Use the following exact structure and prices unless the user provides a new dataset:

• Pintjes: "1 P" (€1.80), "2 P" (€3.60), "3 P" (€5.40), "4 P" (€7.20), "5 P" (€9.00).
• Frisdrank: "Cola" (€1.80), "Cola Zero" (€1.80), "Ice-Tea" (€1.80), "Ice-Tea Green" (€1.80), "Fanta" (€1.80).
• Zware Bieren: "Duvel" (€3.00), "Duvel Citra" (€3.50), "Westmalle" (€3.50), "Karmeliet" (€3.00), "Hapkin" (€2.50), "Omer" (€3.00), "Chouffe Rouge" (€3.50), "Kasteel Rouge" (€3.50), "Ter Dolen" (€3.00), "Tongerlo" (€3.00).
• Wijn etc: "Witte Wijn" (€3.00), "Rose Wijn" (€3.00), "Rode Wijn" (€3.00), "Belini" (€3.00), "Aperol" (€7.00), "Cava" (€3.00).

Output Contract

Provide the full, copy-pasteable code for all three files (dynamic_pricing_gui.py, streamlit_app.py, main.py). Do not use placeholders like "# rest of code here". Ensure the code handles file existence checks and basic error handling for the JSON file.

Triggers

• create a bar stock exchange python project
• python gui streamlit dynamic pricing
• tkinter streamlit json sync project
• bar price manager app
• dynamic pricing system with gui and dashboard