I have a short Python script that uses Tkinter to display an image.
Here is the script
===================================================================
import sys, os
from Tkinter import *
root = Tk() # A: create a global variable named "root"
def showPicture(imageFilename):
# global root #C: make root global
root = Tk() # B: create a local variable named "root"
imageFrame = Frame(root)
imageFrame.pack()
imageObject = PhotoImage(file=imageFilename)
label = Label(imageFrame,image=imageObject)
label.pack()
root.mainloop()
showPicture("python_and_check_logo.gif")
===================================================================
The strange thing is that it crashes with this traceback...
===================================================================
Traceback (most recent call last):
File "easygui_test3.py", line 19, in <module>
showPicture("python_and_check_logo.gif")
File "easygui_test3.py", line 14, in showPicture
label = Label(imageFrame,image=imageObject)
File "L:\FergLabstatPublic\Python26\lib\lib-tk\Tkinter.py", line
2474, in __init__
Widget.__init__(self, master, 'label', cnf, kw)
File "L:\FergLabstatPublic\Python26\lib\lib-tk\Tkinter.py", line
1940, in __init__
(widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: image "pyimage1" doesn't exist
===================================================================
If I comment out either line A or line B, the script works fine.
What I don't understand is why creating a global "root" variable and a
local "root" variable causes the script to crash.
Even more puzzling... if I uncomment line C, so that "root" in line B
refers to a global "root" variable, the script still crashes.
I'm totally baffled. Does anybody know what is going on here?
-- Steve Ferg
(I'm running Python 2.6 under Windows, but I get the same behavior
under Solaris.)
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