def Welcome():
	# Displays a text console menu. 
	# Press 1 for this item, press 2 for that item
	
	
def User_Input():
	# gets user console imput
	
	return user_selection

	
def Process_Stock(user_selection, stock_level, payment_token, sales_total):
	# Checks the stock level for the item the user selected.
	# If the stock level (saved in stock_level list) is > 0 a message is displayed and stock count -1
	# A payment_token is set to the user selection and passed to Payment() and Dispense() if in stock.
	
	
def Payment(payment_token, stock_level, sales_total):
	# The payment_token is used to decide how much to charge.
	# If payment_token = 1, then ask for the price of item 1...

	
def Dispense(payment_token):
	# Uses a switch to dispense whatever item payment_token is set to.
	
	
def Main(stock_level, sales_total):

	user_selection = 0  # Variable holds the key the user pressed, 1-8, 0 if unused/error
	payment_token = 0  # Token is set to the key/item number of user selection (if in stock) and passed to payment function

	while(user_selection == 0):

		Welcome()

		user_selection = User_Input()

		# Process Stock
		# Check the stock level
		# Add one to the sales_total if in stock
		# reduce stock level by 1
		# set payment_token to the key number.
		payment_token = Process_Stock(user_selection, stock_level, payment_token, sales_total)
		
		# If stock present, ask for payment
		# Payment_token is set to the item selection key number if there's stock.
		Payment(payment_token, stock_level, sales_total)

		# Dispense item
		Dispense(payment_token)



	return stock_level, sales_total
	

if __name__ == '__main__':
	stock_level = {0: 0, 1: 5, 2: 5, 3: 5, 4: 5, 5: 5, 6: 5}  # Selection number : items in stock
	sales_total = {0: 0, 1: 0, 2: 0, 3: 0, 4: 0, 5: 0, 6: 0}  # Selection number : sales total for that item

	Main(stock_level, sales_total)

	
@app.route("/")
def index():
	return render_template('index.html')

# Press Key 1
@app.route("/key_one", methods=['POST'])
def button_1():
	item = 'Chips - Cheese 50g'
	price = 1
	return render_template('confirmation.html', title="Pressed Key 1!", item = item, price = price)

Quote: Basically I want a webpage where you click a button to choose a snack and Flask does code after that.