def account_number():
    """Return a random bank account number."""
    account = [random.randint(1, 9) for _ in range(20)]
    return "".join(map(str, account))
def account_number():
    """Return a random bank account number."""
    account = [random.randint(1, 9) for _ in range(20)]
    return "".join(map(str, account))
def account_number ( ) : account = [ random . randint ( 1 , 9 ) for _ in range ( 20 ) ] return "" . join ( map ( str , account ) )
Return a random bank account number.
Return a random bank account number .