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With the appropriate function identified, amend the code to control how often the request for
the web page is sent to the server. The Beans’R’Us webmaster has been in touch to say that
their web-based pricing information is updated every 15 minutes. Fill in the blanks in the code
as indicated by the dashed lines.
Hints: 15 minutes equates to 15 multiplied by 60 seconds, which is 900 seconds. Also: to use
the functionality provided by a library, remember to import it first.

import urllib.request

price = 99.99

while price > 4.74:

page = urllib.request.urlopen("http://www.beans-r-us.biz/prices.html")
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])
print ("Buy!")

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