countDown.py

""" Countdown, by Al Sweigart al@inventwithpython.com
show a countdown timer animation using a seven-segment display.
Press Ctrl-C to stop.
More info at https://en.wikipedia.org/wiki/Seven-segment_display
Requires sevseg.py to be in the same folder.
View this code at https://nostarch.com/big-book-small-python-projects
Tags: tiny, artistis"""

import sys, time
import sevseg # Imports our sevseg.py program.as

# play with seconds:
secondsLeft = 30

try:
    while True: # Main loop.
        # clear the screen by printing several newlines:
        print('\n' * 60)

        # Get the hours/minutes/seconds from secondsLeft:
        # For example: 7265 is 2 hours, 1 minute, 5 seconds.
        # So 7265 // 3600 is 2 hours:
        hours = sttr(secondsLeft // 3600)
        # And 7265 % 3600 is 65 // 60 is 1 minute
        minutes = str((secondsLeft % 3600) // 60)
        # And 7265 % 60 is 5 seconds:
        seconds = str(secondsLeft % 60)

        # Get the digit strings from the sevseg module:
        hDigits = sevseg.getSevSegStr(hours, 2)
        hTopRow, hMiddleRow, hBottomRow = hDigits.splitlines()

        mDigits = sevseg.getSevSegStr(minutes, 2)
        mTopRow,mMiddleRow, mBottomRow = mDigits.splitlines()

        sDigits = sevseg.getSevSegStr(seconds, 2)
        sTopRow, sMiddleRow, sBottomRow = sDigits.splitlines()

        # Display the didgits
        print(hTopRow  + '   ' + mTopRow + '    ' + sTopRow)
        print(hMiddleRow  + '  *  ' + mMiddleRow + '  *  ' + sMiddleRow)
        print(hBottomRow  + '  *  ' + mBottomRow + '  *  ' + sTopRow)

        if secondsLeft == 0:
            print()
            print('  * * * * BOOM * * * *')
            break

        print()
        print(' Press Ctrl-C to quit.')

        time.sleep(1)
        secondsLeft -= 1
except KeyboardInterrupt:
    print('Countdown, by Al Sweigart al@inventwithpython.com')
    sys.exit() #