Python习题 177：设计银行账户类并实现存取款功能

class BankAccount:
    def __init__(self, account_holder, balance=0.0):
        """
        Initialize a BankAccount.

        Args:
        - account_holder (str): The name of the account holder.
        - balance (float): Initial balance. Default is 0.0.
        """
        self.account_holder = account_holder
        self.balance = balance

    def deposit(self, amount):
        """
        Deposit money into the account.

        Args:
        - amount (float): The amount to be deposited.

        Returns:
        - None
        """
        if amount > 0:
            self.balance += amount
            print(f"Deposit of ${amount:.2f} successful. New balance: ${self.balance:.2f}")
        else:
            print("Invalid deposit amount. Please enter a positive value.")

    def withdraw(self, amount):
        """
        Withdraw money from the account.

        Args:
        - amount (float): The amount to be withdrawn.

        Returns:
        - None
        """
        if 0 < amount <= self.balance:
            self.balance -= amount
            print(f"Withdrawal of ${amount:.2f} successful. New balance: ${self.balance:.2f}")
        elif amount > self.balance:
            print("Insufficient funds. Withdrawal canceled.")
        else:
            print("Invalid withdrawal amount. Please enter a positive value.")

    def get_balance(self):
        """
        Get the current balance of the account.

        Returns:
        - float: The current balance.
        """
        return self.balance

# Example usage:
account1 = BankAccount(account_holder="Alice", balance=1000.0)

account1.deposit(500.0)
account1.withdraw(200.0)
account1.deposit(100.0)

print(f"Current balance for {account1.account_holder}: ${account1.get_balance():.2f}")
'''
Deposit of $500.00 successful. New balance: $1500.00
Withdrawal of $200.00 successful. New balance: $1300.00
Deposit of $100.00 successful. New balance: $1400.00
Current balance for Alice: $1400.00
'''