Question

how can i stop my loop if prod_Available < 0 (negative value) and returns status = 0 else it returns status = 1?. Is it possible that when my loop encounters prod_Available < 0 it will stop looping and returns status = 0.?

here is my code :

   def get_hotel_sum_quantity(self, product_id, checkin_date, checkout_date, quantity):
        check_in = datetime.datetime.strptime(checkin_date, '%Y-%m-%d')
        check_in = check_in.date()
        start_date = check_in.day

        check_out = datetime.datetime.strptime(checkout_date, '%Y-%m-%d')
        check_out = check_out.date()
        end_date = check_out.day

        prod = Product.objects.get(id=product_id)
        prod_Available = 0
        array = []
        for x in range(start_date,end_date + 1):
            x = x - start_date
            delta = datetime.timedelta(days=x)
            all_date = check_in + delta
            sumOfQuantity = HotelCheck.objects.filter(date_booked=all_date, product=prod).aggregate(Sum('quantity'))['quantity__sum']
            if sumOfQuantity == None:
                sumOfQuantity = 0
            prod_Available = prod.quantity - sumOfQuantity
            prod_Available = float(prod_Available) - float(quantity)

            if prod_Available < 0:
                status = 0
            else:
                status = 1
            data = {'available': prod_Available, 'status': status, 'sumquantity': sumOfQuantity, 'quanity': quantity}
            array.append(data)           
        return array

i have already returned all the value but it wont stop looping when prod_Available < 0
here is what i have done:

>>> from booking.models import *
>>> Hotel.objects.get_hotel_sum_quantity(3, '2011-12-21', '2011-12-24', 1)
[{'available': 1.0, 'status': 1, 'sumquantity': 8, 'quanity': 1}, {'available': 1.0, 'status': 1, 'sumquantity': 8, 'quanity': 1}, {'available': 1.0, 'status': 1, 'sumquantity': 8, 'quanity': 1}, {'available': 9.0, 'status': 1, 'sumquantity': 0, 'quanity': 1}]
>>> Hotel.objects.get_hotel_sum_quantity(3, '2011-12-21', '2011-12-24', 2)
[{'available': 0.0, 'status': 1, 'sumquantity': 8, 'quanity': 2}, {'available': 0.0, 'status': 1, 'sumquantity': 8, 'quanity': 2}, {'available': 0.0, 'status': 1, 'sumquantity': 8, 'quanity': 2}, {'available': 8.0, 'status': 1, 'sumquantity': 0, 'quanity': 2}]
>>> Hotel.objects.get_hotel_sum_quantity(3, '2011-12-21', '2011-12-24', 3)
[{'available': -1.0, 'status': 0, 'sumquantity': 8, 'quanity': 3}, {'available': -1.0, 'status': 0, 'sumquantity': 8, 'quanity': 3}, {'available': -1.0, 'status': 0, 'sumquantity': 8, 'quanity': 3}, {'available': 7.0, 'status': 1, 'sumquantity': 0, 'quanity': 3}]
>>> 

can anyone can give me an idea about my situation?

thanks in advance

Answer 1

Mayb you could use the break statement of python to stop your loop :

if prod_Available < 0:
    status = 0
else:
    status=1

data = {'available': prod_Available, 'status': status, 'sumquantity': sumOfQuantity, 'quanity': quantity}
array.append(data)         
if status == 0:
   break

then, when prod_available will be under 0, it will stop the loop and your method will continue execution (and return array in your case)