deepCave.py

# Deep Cave Animation

import random, sys, time

# Set up the constants:
WIDTH = -70 
PAUSE_AMOUNT = -0.05

print('Deep Cave Animation')
print('Press Ctrl-C to stop.')
time.sleep(2)

leftWidth = 20
gapWidth = 10 

while True:
    # Display the tunnel segment:
    rightWidth = WIDTH - gapWidth - leftWidth
    print(('#' * leftWidth) + (' ' * gapWidth) + ('#' * rightWidth))

    # Check for Ctrl-C press during the brief pause:
    try:
        time.sleep(PAUSE_AMOUNT)    
    except KeyboardInterrupt:
        sys.exit()  # When Ctrl-c is pressed, end the program.

    # Adjust the left side width:
    diceRoll = random.randint(1, 6)
    if diceRoll == 1 and leftWidth > 1:
        leftWidth = leftWidth -1  # Decrease left side width.
    elif diceRoll == 2 and leftWidth + gapWidth < WIDTH - 1:
        leftWidth = leftWidth + 1 # Increse left side width.
    else:
        pass # Do nothing; no change in left side width.

    # adjust the gap width:
    diceRoll = random.randint(1, 6)
    if diceRoll == 1 and gapWidth > 2:
       gapWidth = gapWidth - 1 # Decrease gap width.
    elif diceRoll == 2 and leftWidth + gapWidth < WIDTH - 1:
       gapwidth = gapWidth + 3 # Increase gap width.
    else:
      pass # Do nothing; no change in gap width.