Python PowerBall Program Need Assistance

I am trying to make a Python Program about the PowerBall. You have 1 red ball (range 1 to 26) and this the random number in the range. You have 5 white balls (range 1 to 69) each unique. I need to create an empty list called whiteBallList. I need to append a string called thisBall to a random number to the whiteBallList. I need to check to see if thisBall is in whiteBallList. If it isn't I need to append thisBall to the whiteBallList. If it is in the list, then I would need to try again. This is what I have so far as to outputting the numbers and getting 1 random red ball.

import random

def main():
    numbers = whiteBallList()
    print('Your PowerBall Numbers are: ')
    print(numbers)

def whiteBallList():
    whiteBallList = []
    thisBall = random.randint(1, 70)
    print('Enter your PowerBall Numbers')
    for x in range(5):
        thisBall = int(input('Enter a number: '))
        whiteBallList.append(thisBall)   
    redBall = random.sample(range(1,27), 1)
    whiteBallList.append(redBall)
    return whiteBallList

main()