写一段银行管理系统的python代码

下面是一个简单的银行管理系统的 Python 代码示例：

class Bank:
    def __init__(self, name):
        self.name = name
        self.accounts = {}

    def create_account(self, account_number, initial_balance):
        if account_number in self.accounts:
            raise ValueError("Account number already exists")
        self.accounts[account_number] = initial_balance

    def deposit(self, account_number, amount):
        if account_number not in self.accounts:
            raise ValueError("Account does not exist")
        self.accounts[account_number] += amount

    def withdraw(self, account_number, amount):
        if account_number not in self.accounts:
            raise ValueError("Account does not exist")
        if self.accounts[account_number] < amount:
            raise ValueError("Insufficient balance")
        self.accounts[account_number] -= amount

    def get_balance(self, account_number):
        if account_number not in self.accounts:
            raise ValueError("Account does not exist")
        return self.accounts[account_number]

这个银行管理系统只包含了几个基本功能，如创建账户、存款、取款和查询余额。你可以根据需要进行修改和扩展。