Please convert Java to Python.

public abstract class BankAccount

{

private double balance;

/**

Constructs a bank account with a zero balance.

*/

public BankAccount()

{

balance = 0;

}

/**

Constructs a bank account with a given balance.

@param initialBalance the initial balance

*/

public BankAccount(double initialBalance)

{

balance = initialBalance;

}

/**

Deposits money into the bank account.

@param amount the amount to deposit

*/

public void deposit(double amount)

{

balance = balance + amount;

}

/**

Withdraws money from the bank account.

@param amount the amount to withdraw

*/

public void withdraw(double amount)

{

balance = balance - amount;

}

/**

Gets the current balance of the bank account.

@return the current balance

*/

public double getBalance()

{

return balance;

}

/**

Overrides the default toString method of Object

@return the class of the object and its instance fields

*/

public String toString()

{

return getClass().getName() + "[" + "balance=" + balance + "]";

}

}