Question

我有一个列表框，我想每分钟更新一次。它会提取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我遇到错误试图让它运行后遇到bug。我认为我的主要问题是没有正确调用应用程序，但我可能错了。这是一些相关的代码。

这完全在主要课程之外

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，这是最终落后于所有错误的地方。

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'

Answer 1

我认为您应该在app的函数调用中直接使用refresher：

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()

Answer 2

看起来问题就在这里：

Application.entryVar(Application)

Application是一个类而不是一个对象，所以我的猜测是你应该在该代码中使用Application两个地方的实例。

使用.after方法更新Python Tkinter GUI

2 个答案: