New submission from Dominic Mayers <dominic_may...@yahoo.com>:

My first "bug" report here. Not sure I am doing it right. It is just that if I 
execute the code

    import tkinter
    from tkinter import simpledialog
    tkinter.Tk().withdraw() 
    integer_value = simpledialog.askinteger('Dialog Title', 'What is your 
age?', minvalue=0, maxvalue=100)

It works. In particular, when the line `parent = tkinter._default_root` is 
executed in simpledialog.py, `_default_root` is defined.  However, if I execute 
the code

    import tkinter
    from tkinter import simpledialog
    integer_value = simpledialog.askinteger('Dialog Title', 'What is your 
age?', minvalue=0, maxvalue=100)

which does not have the line `tkinter.Tk().withdraw()` it does not work. When 
the line `parent = tkinter._default_root` is executed, `_default_root` is not 
defined. 

I don't know if it is a bug. I don't understand the remainder of the code 
enough to say. However, the purpose of this line is to define a parent when 
none is provided. It seem to me that it should be possible to find a parent 
window...

----------
components: Tkinter
messages: 359106
nosy: dominic108
priority: normal
severity: normal
status: open
title: Missing default root in tkinter simpledialog.py
type: behavior
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39171>
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