Python 3.3中的time.sleep（）函数？

Question

I'm trying to continuously run through a WHILE loop to check for a condition every fifteen minutes. When using time.sleep(900) it instead holds off on executing the WHILE loop initially for fifteen minutes and then ceases to run through once the condition is met.

I believe Python 2 used this function for this reason, does Python 3.3 not follow this anymore? If not, how would I indefinitely run through a while loop, even if the condition has been met?

Below is a snippet of my code currently:

if price_now == 'Y':
    print(get_price())
else:
    price = "99.99"
    while price > "7.74":
        price = get_price()
        time.sleep(5)

Edit: Updated based on eandersson feedback.

if price_now == 'Y':
    print(get_price())
else:
    price = 99.99
    while price > 7.74:
        price = get_price()
        time.sleep(5)

The get_price() function:

def get_price():
    page = urllib.request.urlopen("link redacted")
    text = page.read().decode("utf8")
    where = text.find('>$')
    start_of_price = where + 2
    end_of_price = start_of_price + 4
    price = float(text[start_of_price:end_of_price])
    return(price)

Answer 1

I think the problem in this case is that you are comparing a string, and not an float.

price = 99.99
while price > 7.74:
    price = get_price()
    time.sleep(5)

And you need to change the get_price function to return an float, or wrap it with float()

I even made a small test function to make sure and it works as intended with the sleep function.

price = 99.99
while price > 7.74:
    price += 1
    time.sleep(5)

Edit: Updated based on comments.

if price_now == 'Y':
    print(get_price())
else:
    price = 0.0
    # While price is lower than 7.74 continue to check for price changes.
    while price < 7.74: 
        price = get_price()
        time.sleep(5)