Simple inheritance (newbie)

class Payment:
    def __init__(self):
        self.amount = 0
    def __init__(self, amount):
        self.amount = amount
    def get_amount(self):
        return self.amount

class CCPayment(Payment):
    def __init__(self, card_no, amount):
        super(CCPayment, self).__init__(amount)
        self.card_no = card_no
    def get_card_no(self):
        return self.card_no

from Payment import CCPayment
from Payment import Payment

a = CCPayment('1234', 10)

class Payment(object):

class Payment:
    def __init__(self, amount=0):
        self.amount = amount