marquee.py

# marquee.py

# These are examples of the strings we want to produce with WIDTH = 10
# and MESSAGE = 'Hello':

# First phase (showing the left part of the MESSAGE string):
'          '
'         H'
'        He'
'       Hel'
'      Hell'
'     Hello'

# Second phase (showing the full MESSAGE with decreasing indentation):
'    Hello '
'   Hello  '
'  Hello   '
' Hello    '
'Hello     '

# Third phase (showin the right part of MESSAGE with zero indentation):
'ello      '
'llo       '
'lo        '
'o         '
'          '



import time

# Experiment with changing these CONSTANT variable values:
WIDTH = 30
MESSAGE = 'Hello! How are you doing today?'
DELAY = 0.1  # How many seconds to pause

while True:
    # First phase:
    leftChars = 0
    while leftChars <= len(MESSAGE):
        print('\n' * 30) # Print a bunch of newlines to "clear" the screen.
        print(' ' * (WIDTH - leftChars) + MESSAGE[0:leftChars])
        time.sleep(DELAY)
        leftChars = leftChars + 1

    # Second phase:
    i = leftChars
    while WIDTH - i >= 0:
        print('\n' * 30)
        print(' ' * (WIDTH - i) + MESSAGE)
        time.sleep(DELAY)
        i = i + 1

    # Third phase:
    i = 1
    while i < len(MESSAGE):
        print('\n' * 30)
        print(MESSAGE[i:len(MESSAGE)])
        time.sleep(DELAY)
        i = i + 1