寻找将对象放入“列表对象”的OOP Pythonic方法，而不是仅使用[list]

Question

由于某种原因，我无法概念化如何使用Checkbook.class对象而不是“ ledger [list]”。什么是实现本准则目标的最佳实践方法？（是的，我也有其他“新手”问题，但是我很乐意得到一些建议。）import sysimport timetransNum=0ledger = []debitInput=['Check Number: ', 'Transaction Date: ',            'Payee: ', 'Amount: ', 'Memo (or Enter to skip): ']creditInput=['Check Number: ', 'Transaction Date: ',            'Source: ', 'Amount: ', 'Memo (or Enter to skip): ']# a Payee is a persistent record/lookup of current, past and new payeesclass Payee:    pass# a Source is a persistent record/lookup of current, past and new sourcesclass Source:    pass# a Checkbook is a collection of Transaction objects upon which queries may be performedclass Checkbook:    def __init__(self, newTrans):        pass# a Transaction is a collection of Debit and Credit objectsclass Transaction:    def __init__(self, chkNum, transDate, thirdParty, amount, memo=''):        self.chkNum = chkNum        self.transDate = transDate        self.memo=memo        self.thirdParty=thirdParty        self.amount=amount        self.transNum = transNumclass Debit(Transaction):    def __init__(self, *args):        Transaction.__init__(self, *args)        self.payee=self.thirdParty        del self.thirdParty        self.amount=int(self.amount)*-1class Credit(Transaction):    def __init__(self, *args):        Transaction.__init__(self, *args)        self.source=self.thirdParty        del self.thirdParty        self.amount=int(self.amount)while True:    transact = []    transNum += 1    choice=input('Posting debit [d], credit [c] or [x] to exit: ')    if choice == 'x': break    elif choice == 'd':        for field in debitInput:            field = input(field)            transact.append(field)        trans = Debit(transact[0], transact[1], transact[2], transact[3], transact[4])        ledger.append(trans)

Answer 1

class Checkbook:

    def __init__(self):

        self.transactions = []    # Checkbook is just a wrapper around a list

    def __getitem__(self, index): # implementing [x]

        return self.transactions[index]

    def __setitem__(self, index, transaction): #implementing [x] = i

        self.transactions[index] = transaction

    def append(self, transaction): # implementing .append(x)

        self.transactions.append(transaction)

    def extend(self, transaction_list): # implementing .extend([x,y,z])

        self.transactions.extend(transaction_list)

    # and so on for every method which you want to support

或者，您可以继承list。

这是做作业吗？在Python中分配它是很愚蠢的。您永远不会真正想要继承list。在大学里，我有一个更好的练习，在该练习中，我必须重新std::vector使用模板，动态数组（带有malloc()）和运算符重载……，这真有趣！该std::map演习是更好:)