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Using Tkinter under Python 2.7.1 (Windows XP FWIF)
If using the tkSimpleDialog.askinteger() function with an initialvalue = 0, the 0 is not displayed in the dialog box. The same is true for tkSimpleDialog.askfloat().
The cause of this seems to be the following:
in Lib\libi-tk\tkSimpleDialog.py (attached for convenience) 
under class _QueryDialog(Dialog)
 def body(self, master):
 w = Label(master, text=self.prompt, justify=LEFT)
 w.grid(row=0, padx=5, sticky=W)
 self.entry = Entry(master, name="entry")
 self.entry.grid(row=1, padx=5, sticky=W+E)
 if self.initialvalue:
 self.entry.insert(0, self.initialvalue)
 self.entry.select_range(0, END)
 return self.entry
The if self.initialvalue will evaluate to a FALSE when the initial value is a 0.
Changing this line to:
if self.initialvalue is not None:
fixed this issue.
I am not certain that this is as intended or a bug.

Add patch for py3k

New changeset fd5166fdb978 by Andrew Svetlov in branch '3.2':
Issue #12288: Consider '0' and '0.0' as valid initialvalue for tkinter SimpleDialog.
http://hg.python.org/cpython/rev/fd5166fdb978
New changeset 2f3ccf4ec193 by Andrew Svetlov in branch 'default':
Issue #12288: Consider '0' and '0.0' as valid initialvalue for tkinter SimpleDialog.
http://hg.python.org/cpython/rev/2f3ccf4ec193
New changeset f98e2944cb40 by Andrew Svetlov in branch '2.7':
Issue #12288: Consider '0' and '0.0' as valid initialvalue for tkinter SimpleDialog.
http://hg.python.org/cpython/rev/f98e2944cb40 

Fixed. Thank you, Tom.