1、定义银行帐户类,变量有“帐号”和“存款余额”,“存取历史〞,方法有“存 款”、“取款”、“查询余额”、〞品示帐号”以及存储功能,能查询历史存取记录

以下是银行账户类的定义，其中包含了帐号、存款余额、存取历史等属性，以及对应的方法实现：

class BankAccount:
    def __init__(self, account_num):
        self.account_num = account_num
        self.balance = 0
        self.history = []

    def deposit(self, amount):
        self.balance += amount
        self.history.append('Deposit: +{}'.format(amount))

    def withdraw(self, amount):
        if amount > self.balance:
            print('Insufficient funds')
        else:
            self.balance -= amount
            self.history.append('Withdrawal: -{}'.format(amount))

    def get_balance(self):
        return self.balance

    def display_account_num(self):
        print('Account number:', self.account_num)

    def show_history(self):
        print('Transaction history:')
        for transaction in self.history:
            print(transaction)

以上就是一个简单的银行账户类的实现，可以通过实例化这个类来创建一个具体的银行账户对象。例如，我们可以这样创建一个账户并进行存款、取款、查询余额、查询历史交易记录等操作：

# Create a bank account
my_account = BankAccount('0001')

# Deposit some money
my_account.deposit(1000)

# Withdraw some money
my_account.withdraw(500)

# Check the balance
print('Current balance:', my_account.get_balance())

# Display the account number
my_account.display_account_num()

# Show the transaction history
my_account.show_history()

输出结果如下：

Current balance: 500
Account number: 0001
Transaction history:
Deposit: +1000
Withdrawal: -500