[Tkinter] output to canvas widget

[freakbot]

First post here on this new forum.

I'm trying to get a windows 'dir' command output to display in a canvas widget. Ultimately I want to built an interactive program than will display the output in the canvas widget; this is the first step to get it working.

from Tkinter import *
import subprocess

class window:


   def __init__(self, parent):
       self.frame=Frame(parent)
       self.frame.pack()
       self.gobutton = Button(self.frame, text="Go", command=self.dircall)
       self.gobutton.grid(row=0, column=1)
       self.canvas = Canvas(root, width = 100, height = 100, bg = "white")
       self.canvas.pack()
   def dircall(self):
       output=subprocess.call(["dir", "c:"], shell=True)
       self.canvas.create_text(25, 25, text=output, tags="text")


root = Tk()
root.geometry("200x200")
runit=window(root)
root.mainloop()

When started the GUI opens and then when the button is clicked the output is a 0 and the output from the dir command goes to the run output part of my IDE. I don't get and error, it just doesn't quite do what I want it to.

Any help pointing me to the solution would be appreciated.