python之使用 .after 方法更新 Python Tkinter GUI

我有一个列表框，我想每分钟更新一次。它提取 XML 数据，对其进行解析并自动将其放入列表框中。我已经想出使用 .after 方法但是在类之外实现它时我遇到了一个又一个错误试图让它运行的错误。我相信我的主要问题只是没有正确调用应用程序，但我可能是错的。这是一些相关的代码。

这一切都在主类之外

def refresher(frame): 
    subreddit=Application.entryVar(Application) 
    Application.getXML(subreddit) 
    frame.after(1000,refresher,frame) 
 
main = tk.Tk() 
main.wm_title("Readdit") 
# main.geometry("350x400") 
app = Application(master=main) 
# Begins the applications GUI loop 
# app.__init__() 
refresher(main) 
app.mainloop() 

这是程序的开始，也是它最终返回到所有错误的地方。

class Application(tk.Frame): 
 
    print("what about this?") 
    def __init__(self, master=None): 
        self.threadTitle = tk.StringVar() 
        self.threadAuth = tk.StringVar() 
        self.threadPub = tk.StringVar() 
        self.threadArtLink = tk.StringVar() 
        self.threadLink = tk.StringVar() 
        self.threadImg = tk.StringVar() 
        self.threadArtLink.set('Click something to display thread info') 
        self.photo = Image.open("temp.png") 
        self.photo = self.photo.resize((250,250), Image.ANTIALIAS) 
        self.threadImage = ImageTk.PhotoImage(self.photo) 
        self.errMes = tk.StringVar() 
        if not os.path.exists('Pics'): 
            os.makedirs('Pics') 
        # print('Something') 
 
 
 
        # Intializes tkinter gui framework 
        tk.Frame.__init__(self, master) 
        # Packs widgets needed 
        self.grid() 
        # Creates the widgets functions 
        self.createWidgets() 
        # Intializes the man rss.xml 
        self.initial() 
 
    def createWidgets(self): 
        # Create entrybox and align to grid 
        self.send_entry = tk.Entry(self) 
        self.send_entry.grid(row=0,column=0) 
 
        # Create button,allign to grid, get xml 
        self.change_sub = tk.Button(self,text='Change Subreddit',padx=5, pady=5, command=lambda :self.entryVar()) 

这是完整的错误

Traceback (most recent call last): 
  File "S:/Projects/xmlParser.py", line 306, in <module> 
    refresher(main) 
  File "S:/Projects/xmlParser.py", line 296, in refresher 
    subreddit=Application.entryVar(Application) 
  File "S:/Projects/xmlParser.py", line 290, in entryVar 
    rawInput=self.createWidgets(self).send_entry.get() 
  File "S:/Projects/xmlParser.py", line 40, in createWidgets 
    self.send_entry = tk.Entry(self) 
  File "C:\Python33\lib\tkinter\__init__.py", line 2506, in __init__ 
    Widget.__init__(self, master, 'entry', cnf, kw) 
  File "C:\Python33\lib\tkinter\__init__.py", line 2068, in __init__ 
    BaseWidget._setup(self, master, cnf) 
  File "C:\Python33\lib\tkinter\__init__.py", line 2046, in _setup 
    self.tk = master.tk 
AttributeError: type object 'Application' has no attribute 'tk' 

请您参考如下方法:

我认为您应该在 refresher 的函数调用中直接使用您的 app:

def refresher(frame): 
    frame.getXML()# I Don`t know what do this function, just an example 
    frame.after(1000,refresher,frame) 
 
main = tk.Tk() 
main.wm_title("Readdit") 
# main.geometry("350x400") 
app = Application(master=main) 
# Begins the applications GUI loop 
# app.__init__() 
refresher(app) #use app here 
app.mainloop()