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tkFileDialog with tKinter

P: 7
I am trying to make a simple app to select and operate on data. I am using Tkinter to build a GUI with four labels and four buttons, side by side. However, for some reason when I run the script, all the button commands get called, asking the user to select all files upon startup, and then afterwards the buttons do not work. Here's my code:
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  1. import numpy
  2. import scipy
  4. from Tkinter import *
  5. import tkFileDialog as tkf
  7. filenames = {}
  9. class App:
  10.     def __init__(self, master):
  12.             frame = Frame(master)
  13.             frame.pack()
  15.             self.Name0 = Label(frame, text = "Initial Data", width=30).grid(row=0, sticky=W,columnspan=2)
  16.             self.Name1 = Label(frame, text = "After Change #1", width=30).grid(row=1, sticky= W,columnspan=2)
  17.             self.Name2 = Label(frame, text = "After Change #2", width=30).grid(row=2,sticky=W,columnspan=2)
  18.             self.Name3 = Label(frame, text = "Current State", width=30).grid(row=3,sticky=W,columnspan=2)
  20.             self.Butt0 = Button(frame, text = "Select", command=tkf.askopenfile()).grid(row=0,column=2)
  21.             self.Butt1 = Button(frame, text = "Select", command=tkf.askopenfile()).grid(row=1,column=2)
  22.             self.Butt2 = Button(frame, text = "Select", command=tkf.askopenfile()).grid(row=2,column=2)
  23.             self.Butt3 = Button(frame, text = "Select", command=tkf.askopenfile()).grid(row=3,column=2)
  25.     def openfile(self,n):
  26.         print "Okay"
  27.         #More will go here
  30. root = Tk()
  32. app = App(root)
  34. root.mainloop()

The funny things is that if I remove the dependence on n from the "openfile" method, it works. But obviously, I want to import four distinct sets of data, so I need the dependence on n. This makes no sense! Please help.
Feb 15 '12 #1
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1 Reply

Expert Mod 2.5K+
P: 2,851
Your button "commands" are being executed as the code is interpreted. "command" needs to be set to a function, not what a function returns. I might initialize 4 attributes to contain the file names and assign "command" similar to this:
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  1.             self.Butt0 = Button(frame, text = "Select", command=lambda: self.ask_file_name(self.fn1)).grid(row=0,column=2)
You would need a method "ask_file_name" that would accept the variable for assignment of the file name.
Feb 15 '12 #2

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