money = input("How much money do you have? ")
def checkMoney(money):
    '''
    (str) -> (str)

    Checks to make sure that there are no weird characters.
    '''
    for x in money:
        if x not in numbers:
            money = input("How much money do you really have? ")
            checkMoney(money);

    return(money)

checkMoney(money);
print(money)
money = float(money)