Python TkInter綁定破解

Question

我有一個簡單的GUI使用鍵綁定 - 這樣的事情。

import Tkinter, tkFileDialog 

class Foo(object): 
    def __init__(self, master): 
     master.bind('3', self.do_bar) 
     master.bind('9', self.load_new_config) 

     self.load_config() 

     if not self.conf: 
      self.load_new_config() 
     else: 
      self.load_data() 

    def load_config(self): 
     try: 
      self.conf = #get stuff from known file 
     except FailedToGetStuff: 
      self.conf = None 

    def load_new_config(self): 
     path = askopenfilename(initialdir='~') 
     self.conf = #get stuff from file in path 
     self.load_data() 

    def load_data(self): 
     #get data from self.conf, process and display 

    def do_bar(self): 
     #do stuff with displayed data 

if __name__ == "__main__" 
    root = Tk() 
    Foo(root) 
    root.mainloop() 

現在，當load_config（）找到它正在查找的內容時，它工作得很好。我可以使用綁定，甚至在使用'9'並加載新配置後，一切正常。
問題是，如果load_config（）失敗，self.conf被設置爲None，並且從__init__調用load_new_conf，則綁定不再可用。

我發現問題是由__init__內調用tkFileDialog.askopenfilename（）引起的。我不明白的是爲什麼會發生這種情況，以及如何解決這個問題。

Answer 1

此代碼的工作對我來說：

import Tkinter, tkFileDialog 

class Foo(object): 
    def __init__(self, master): 
     master.bind('<KeyPress-3>', self.do_bar) 
     master.bind('<KeyPress-9>', self.load_new_config) 

     self.load_config() 

     if not self.conf: 
      master.after(1, self.load_new_config) 
     else: 
      self.load_data() 

    def load_config(self): 
     try: 
      self.conf = None#get stuff from known file 
     except FailedToGetStuff: 
      self.conf = None 

    def load_new_config(self, e = 0): 
     path = tkFileDialog.askopenfilename(initialdir='~') 
     self.conf = None#get stuff from file in path 
     self.load_data() 

    def load_data(self, e = 0): 
     pass 
     #get data from self.conf, process and display 

    def do_bar(self, e = 0): 
     print 1 
     #do stuff with displayed data 

if __name__ == "__main__": 
    root = Tkinter.Tk() 
    Foo(root) 
    root.mainloop()