Kivy添加窗口小部件的參數錯誤

Question

當我嘗試添加一個Label從.csv文件「arrowscore」檢索我遇到了錯誤的變量：

TypeError: add_widget() missing 1 required positional argument: 'widget' 

這是我的基本代碼：

class EvaluateScreen(Screen): 
pass 


class EvaluateLayout(BoxLayout): 
    global endNo 
    def update(stuff): 
     def readMe(endNo, i): 
      f = open("end" + str(endNo) + ".csv", "r") # opens the csv 
      lines = [line.rstrip('\n') for line in f] #reads the lines of the file 
      del lines[0] #removes the meta-value inside of the file 
      lines = lines[0] #extracts a 1d array (single line) from the lines 
      lines = lines.split(",") #splits the csv line into separate values in a list 
      print(lines) #for debugging purposes 
      f.close() # closes the file 
      return lines[int(i)] # returns the requested value 

     if canDrawScores == True: #if an external variable is true 
      for i in range(0,5): #for values 0 to 5 
       arrowScore = readMe(endNo, i) 
       BoxLayout.add_widget(Label(text=str(arrowScore))) #add a new label to the BoxLayout with text as the retrieved value 

    Clock.schedule_interval(update, 0.5) #checking if the external variable is true every half second 

---編輯，但仍然是斷開---- 現在代碼是提高在self.do_layout一個AttributeError，指出「浮動」對象具有「do_layout」 類EvaluateScreen（屏幕）無屬性： 通

class EvaluateLayout(BoxLayout): 
    global endNo 
    global endLimit 
    def update(self): 
     self.do_layout() 
     def readMe(endNo, i): 
      f = open("end" + str(endNo) + ".csv", "r") # opens the end 
      lines = [line.rstrip('\n') for line in f] #reads the lines of the file 
      del lines[0] 
      lines = lines[0] 
      lines = lines.split(",") 
      print(lines) 
      f.close() # closes the file 
      return lines[int(i)] # returns the requested value 

     if canDrawScores == True: 
      for i in range(0,endLimit): 
       arrowScore = readMe(endNo, i) 
       self.add_widget(Label(text=str(arrowScore))) 

Clock.schedule_interval(update, 0.5) 


evaluatescreen = EvaluateScreen() 
evaluatelayout = EvaluateLayout() 
evaluatescreen.add_widget(evaluatelayout) 

Answer 1

您正在使用的BoxLayout（類型），而不是自我（BoxLayout的實例）

def update(stuff): 

    BoxLayout.add_widget(Label(text=str(arrowScore))) #add a new label to the BoxLayout with text as the retrieved value 

更改爲...

def update(self, dt): #<---changed stuff to self and added dt (delta_time) 

    self.add_widget(Label(text=str(arrowScore))) #add a new label to the BoxLayout with text as the retrieved value 

現在最後一個問題：

Clock.schedule_interval(update, 0.5) #checking if the external variable is true every half second 

這是在EvaluateLayout.update方法上完成的，而不是在ñEvaluateLayout instance.update ......你需要單獨的財產以後這些線路

el = EvaluateLayout()#creating the layout here... 
#and later on... 
Clock.schedule_interval(el.update, 0.5) #checking if the external variable is