9. Library time

• Current time in seconds time.clock()

• Am I in daylight saving time? time.daylight()

• Sleep for a few seconds, time.sleep(seconds)

• Timezone time.timezone()

9.1. 10 seconds between each access

from urllib.request import urlopen import time # This is used to increase the program duration to 3 minutes. import sys sys.setExecutionLimit(180000) LOYALTY_PRICES_URL = "https://api.allorigins.win/raw?url=http://beans.itcarlow.ie/prices-loyalty.html" price = 99.99 limit = 0 availability = True while price >= 4.74 or limit <=15: try: page = urlopen(LOYALTY_PRICES_URL) except: print("URL not available at this time.") availability = False break page = urlopen(LOYALTY_PRICES_URL) text = page.read() location = text.find(">$") start = location + 2 end = start + 4 price = float(text[start:end]) if price >= 4.74: print("Waiting 10 seconds... Current price: %5.2f" % price) limit += 1 time.sleep(10) if limit == 16: print("They don't want to lower the price. Buy it for %5.2f pesos" % price) elif limit < 7 and availability == True: print("Buy! price: %5.2f" % price)

9.2. Summary

• Strings are character strings.

• We access individual characters by their index, starting at zero.

• Methods are functions built into variables.

• There are programming libraries with ready-made code.

• Data has a type, such as int or string.

9.3. Python Tools

• text[4] accesses the fifth character.

• text[4:9] accesses from the fifth to the ninth character.

• The method text.find() searches for a substring.

• float() converts something to a floating point number.

• Libraries: urllib.request and time.

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