decimal to base converter

def convert_to_base(number, base):
    remainder_list = []
    while number != 0:
        remainder_list.append(str(number % base))
        number = number // base
    remainder_list.reverse()
    return "".join(remainder_list)

def ask_to_convert(repeat = ""):
    while True:
        convert_yn = input(f"Do you want to convert a base 10 number{repeat}?(y/n): ")
        if convert_yn.lower() == "y" or convert_yn.lower() == "n":
            return convert_yn.lower()
        else:
            print("Must be y or n")
def check_number():
    user_number = "number"
    while not user_number.isdigit():
        user_number = input("Enter a base 10 number to convert: ")
        if not user_number.isdigit():
            print("Must be number")
    user_number = int(user_number)
    return user_number

def check_base():
    user_base="base"
    while not user_base.isdigit():
        user_base = input("Enter a base: ")
        if not user_base.isdigit():
            print("Must be number")
    user_base = int(user_base)
    return user_base

def main():
    print("This program converts a base 10 number to a number of any base \n")
    convert_yn = ask_to_convert()
    while convert_yn == "y":
        user_number = check_number()
        user_base = check_base()
        print(f"the base {user_base} equivalent to decimal numeral {user_number} is: ", convert_to_base(user_number, user_base), "\n")
        convert_yn = ask_to_convert(" again")
        if convert_yn == "n":
            print("Goodbye")

main()