How to calculate total price in django?-CodePudding

I'm building an ecommerce website and trying to calculate the total price of the products in views.py but I'm getting an error.

Here is my code:

@login_required(login_url='/customer/login')
@customer()
def addtocart(request):
    if request.user.is_authenticated:
        buyer = request.user.is_customer
        cart = Cart.objects.filter(buyer = buyer)

        amount = 0.00
        cart_products = [p for p in Cart.objects.all() if p.buyer == buyer]

        if cart_products:
            for p in cart_products:
                t_amount = (p.products.discounted_price)
                total_amount  = t_amount
    return render(request, 'Shop/cart.html', {'cart': cart, 'total_amount': total_amount})

This is what it says in the browser: local variable 'total_amount' referenced before assignment.
Thank you

CodePudding user response：

Your Variable amount = 0.00 should be renamed to total_amount.

CodePudding user response：

When you don't have any cart_products, python is trying to read the variable total_amount, but it is out of scope. Define it on top of the function.

def addtocart(request):
    total_amount = 0.00
    if request.user.is_authenticated:
        ....