写这样一个简单的类用到 n 多 self ，个人觉得有点冗余，大家什么感觉？我也是初学，或者有好的方法可以避免？
class VendingMachine:
"""A vending machine that vends some product for some price."""
def __init__(self,stockName,stockPrice):
self.stockName = stockName
self.stockPrice = stockPrice
self.stockNumber = 0
self.balance = 0
def vend(self):
if self.stockNumber == 0:
return "Machine is out of stock."
elif self.balance < self.stockPrice:
return 'You must deposit $' + str(self.stockPrice - self.balance) + ' more.'
else:
self.stockNumber -= 1
change = self.balance - self.stockPrice;
self.balance = 0
if change == 0:
return 'Here is your candy.'
else:
return 'Here is your candy and $'+ str(change) +' change.'
def deposit(self,amount):
self.balance += amount
if(self.stockNumber == 0):
return 'Machine is out of stock. Here is your $' + str(self.balance) + '.'
return "Current balance: $" + str(self.balance)
def restock(self,stockNumber):
self.stockNumber += stockNumber
return "Current candy stock: " + str(self.stockNumber)
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