python未定義變量

Question

爲什麼變量freq未在方法更新中定義？ 我在init上調用蠟燭方法，這個方法包含freq？

class candle: 
    def __init__(self): 
     self.freq = None 
     self.open_price = None 
     self.high_price = None 
     self.low_price = None 
     self.last_price = None 
     self.volume = 0 

    def addTick(self,tick): 
     if self.open_price is None: 
      self.open_price = tick.price 
     if self.high_price is None or tick.price >self.high_price: 
      self.high_price = tick.price 
     if self.low_price is None or tick.price <self.low_price: 
      self.low_price = tick.price 
     self.last_price = tick.price 
     self.volume = self.volume +1 


    def update(self,tick): 
     self.candle.addTick(tick) 
     if keyfunc(current_time,freq) != reference_timestamp[freq]: 
      self.notify(self.candle) 
      self.candle = candle() 

Answer 1

在Python中沒有隱含self，必須訪問成員變量時，是明確的。

if keyfunc(current_time,freq) != reference_timestamp[freq]: 

應該

if keyfunc(current_time, self.freq) != reference_timestamp[self.freq]: 

不知道從哪裏reference_timestamp定義，假設它是全球性的。

Answer 2

你試圖訪問一個局部變量（不在該範圍中定義）而不是類實例屬性。嘗試self.freq而不是freq。