Dictionary problem?

Question

Python

Hi all. Parsing one site with prices for goods.
Through the get request I accept a json file with the following data:
first option:
{"success":true}
Second option: {"
success":true,"lowest_price":"£1,321.05"}
Third option:
{"success":true," median_price":"£1,321.05"}
Fourth option:
null

And when a product goes into the cycle that has neither a low price nor an average price (the first option), my code breaks, I'm breaking my head, I just can't figure out how to take it into account in the code . For the second and third code does not break. Here is an excerpt from the code below:

r = requests.get(ITEM_URL.format(item[0]) )  #item[0] название товара вставляется в конец ссылки
r = r.json() #конвертирую это в жсон формат

if r == NULL: #для четвертого вариант в случае если сервер вернет null из-за нагрузки
  continue

try:
            lowest_p = str(r["lowest_price"])

        except KeyError:
            if r["success"] != False and r["median_price"] != None:
                lowest_p = str(r["median_price"])
            elif r["success"] == True and r["lowest_price"] == None and r["median_price"] == None:
                continue
            else:
                continue

except TypeError:
            continue

When the first option with success: True goes into the loop and that's it, the loop breaks. Please tell me how to solve this problem.

Answer 1

if r is None:
    continue

price = r.get('lowest_price', r.get('median_price', None))
if price is None:
    continue