billship_handler

def get_total_weight_in_oz(request, order_form):
    # sort the shopping cart by skus so we can match it up with
    # an actual queryset of product data (mostly for the weights)
    cart_by_skus = sorted( request.cart , key=lambda item: item.sku )
    skus = [item.sku for item in cart_by_skus]
    quantities = [item.quantity for item in cart_by_skus]
    products = ProductVariation.objects.filter(product__sku__in=skus).order_by('sku')
    discount = ''
    discounted_products = ''

    if request.session.get('discount_code'):
        discount = DiscountCode.objects.get(code=request.session.get('discount_code'))
        if discount.free_shipping:
            discounted_products = [product.sku for product in discount.all_products()]



    i = 0
    total_weight = 0
    for product in products:
        if product.product.sku not in discounted_products:
            total_weight += quantities[i] * product.weight
            i += 1

    return total_weight * 16