Why won't my Button widget expand vertically

Question

I am familiarizing myself with Tkinter, and I am attempting to write a very simple program, which displays a button in a window, using the pack geometry manager.

I was experimenting with various configuration options for pack(), such as expand, fill, and side, and I've run into a peculiar problem. I have written the following code:

from Tkinter import *

root = Tk()
widget = Button(root, text='text')
widget.pack(expand=YES, fill=BOTH)
root.mainloop()

The problem is that the button expands to fill the window in the horizontal direction, but not the vertical direction. This is the same result that I get if instead of specifying fill=BOTH I use fill=X. In addition, if I specify instead fill=Y the button does not expand in either direction. Something seems to be going wrong with the fill in the vertical direction, and I cannot figure out what it might be.

I attempted to Google this problem and surprisingly found no mention of this happening to anyone else. I am using a Mac with OS X Yosemite and running python 2.7.5. I also attempted to compile with python 3.4.1 and saw no change.

Edit:

Based off of the answer and comments below, it is clear that there is nothing wrong with my code, because it seems to work on other machines. If not an error in the code, does anyone know what could possibly be causing the button to not stretch vertically when I run the above code?

Answer 1

This is a feature of native buttons on OSX. Buttons on OSX will be a fixed height and will not expand vertically. There is nothing you can do, short of using a different widget such as a label.