子类在继承父类初始化属性时，产生矛盾！

父类的初始化参数
class BankAccount:
def __init__(self,name,account,balance):
self.name = name
self.account = account
self.balance = float(balance)
子类初始化参数
class IterestAccount(BankAccount):
def __init__(self,rate):
BankAccount.__init__(self)
self.rate = rate
令BalanceInYears = IterestAccount('ye','zhanghu',50,0.05)时
出现错误
BalanceInYears = IterestAccount('ye','zhanghu',50,0.05)
TypeError: __init__() takes exactly 2 arguments (5 given)
改成 BalanceInYears = IterestAccount(0.05)
出现
BankAccount.__init__(self)
TypeError: __init__() takes exactly 4 arguments (1 given)
心好累啊

子类显示调用父类的__init__方法问题，即BankAccount.__init__(self) 这句有问题，父类既然有初始化参数，子类调用父类的init方法应该也对应带上，应该更改为：

1. def __init__(self,rate,name,account,balance):
   
2.         BankAccount.__init__(self,name,account,balance)
   
3.         self.rate = rate

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