Random shomare-cart generator

cardGenerator.py

#!/usr/bin/python3

import random

def card_generator():
    while True:
        rand_list = [random.randint(0, 9) for iter in range(16)]
        rand_list[0] = random.randint(4, 6)
        numbers_add = 0
        #print (rand_list)

        for index,number in enumerate(rand_list, start=1):
            if (index % 2) != 0:
                number = number * 2
                if number > 9:
                    number = number - 9 
            numbers_add = numbers_add + number
        
        if numbers_add % 10 == 0:
            listToStr = ' '.join([str(number) for number in rand_list])
            return (listToStr.replace(" ",""))
                        

if __name__ == "__main__":
    print (card_generator())

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Python