title: Infinite loop in Tkinter python code
body: <p>I'm trying to run a simple Tkinter program that opens a program when you click a button.  The code is listed below.  I use a command to call a program that then calls a fortran program.  However, when I click on the button, it opens the program but the menu of the program i'm calling goes into an infinite loop......the offending code seems to be in the button1Click module. </p>
  
  <p>Any help is greatly appreciated. </p>
  
  <p>Thanks </p>
  
  <pre><code>from Tkinter import * 
  import os, sys 
  from win32com.client import Dispatch 
  xlApp=Dispatch('Excel.Application') 
  _PSSBINPATH=r"C:\Program Files\PTI\PSSE32\PSSBIN" 
  os.environ['PATH']=_PSSBINPATH+';'+os.environ['PATH'] 
  sys.path.insert(0,_PSSBINPATH) 
  import redirect; redirect.psse2py() 
  import psspy 
  
  class MyApp: 
      def __init__(self, parent): 
          self.myParent = parent  ### (7) remember my parent, the root 
          self.myContainer1 = Frame(parent) 
          self.myContainer1.pack() 
  
          self.button1 = Button(self.myContainer1) 
          self.button1.configure(text="OK", background= "green") 
          self.button1.pack(side=LEFT) 
          self.button1.bind("&lt;Button-1&gt;", self.button1Click) ### (1) 
  
          self.button2 = Button(self.myContainer1) 
          self.button2.configure(text="Cancel", background="red") 
          self.button2.pack(side=RIGHT) 
          self.button2.bind("&lt;Button-1&gt;", self.button2Click) ### (2) 
  
      def button1Click(self,event):    ### (3) 
          psspy.runiplanfile(r"C:\MNTACT\Contingency Program\work\contingency-31-4.irf") 
          if self.button1["background"] == "green": ### (4) 
              self.button1["background"] = "yellow" 
          else: 
              self.button1["background"] = "green" 
  
      def button2Click(self, event):  ### (5) 
          self.myParent.destroy()     ### (6) 
  
  
  root = Tk() 
  myapp = MyApp(root) 
  root.mainloop() 
  </code></pre>