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

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from urllib.request import urlopen

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import time

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​

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# This is used to increase the program duration to 3 minutes.

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import sys

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sys.setExecutionLimit(180000)

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​

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LOYALTY_PRICES_URL = "https://api.allorigins.win/raw?url=http://beans.itcarlow.ie/prices-loyalty.html"

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price = 99.99

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limit = 0

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availability = True

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while price >= 4.74 or limit <=15:

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    try:

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        page = urlopen(LOYALTY_PRICES_URL)

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    except:

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        print("URL not available at this time.")

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        availability = False

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        break

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    page = urlopen(LOYALTY_PRICES_URL)

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    text = page.read()

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    location = text.find(">$")

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    start = location + 2

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    end = start + 4

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    price = float(text[start:end])

Activity: 9.1.1 ActiveCode (ac_l33_9_en)

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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Activity: 9.3.1 Poll (TWP33E)

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