diamond2.py

"""
diamond2.py
This program prints a centered row of Os of varying sizes:
    O
    O
   OOO
  OOOOO
 OOOOOOO
OOOOOOOOO
 OOOOOOO
OOOOOOOOO
 OOOOOOO
  OOOOO
 OOOOOOO
OOOOOOOOO
OOOOOOOOO
 OOOOOOO
  OOOOO
 OOOOOOO
  OOOOO
 OOOOOOO
  OOOOO
 OOOOOOO
  OOOOO
"""

import random, time
# Experiment with changing these CONSTANT variable values:
MAX_SIZE = 10
DIAMOND_CHAR = 'O'

oCount = 1

while True:
    if random.randint(0, 1) == 0:
        # Increase the size of the diamond
        if oCount <= MAX_SIZE - 2: # Only increase if it won't increase beyond MAX_SIZE.
            oCount = oCount + 2
    else:
        # Decrease the size of the diamond
        if oCount >= 3: # Only decrease if it won't decrease to less than 1.
            oCount = oCount - 2

    spaceCount = (MAX_SIZE - oCount) // 2
    print(' ' * spaceCount + DIAMOND_CHAR * oCount)
    time.sleep(0.1)