Pennies.py

import time 

prompt = """
        You have a choice:

        a) $1 million, right now
        b) $0.02 right now, then doubled every month
"""

while True:
        choice = input(prompt)
        normalized_choice = choice.lower().strip()
        if normalized_choice in ['a', 'b']:
                break 
        else:
                print("Dude. A or B!!")
                print()
                print()

if normalized_choice == 'a':
        print("Here is your money: ${}".format('1 million'))
        print("Here is how much you would have gotten, had you chosen a")
        print()

bank = 0.02
month = 1
while True:
        print("After {} month(s)".format(month), end=" ")
        print("there is ${:0,.2f} in the bank".format(bank))
        bank *= 2
        month += 1
        time.sleep(0.5)