New submission from Drew French <rectangletan...@gmail.com>:

In the <BaseWidget._setup> method, <master> is evaluated as a Boolean (when 
Tkinter attempts to find a parent for the widget). I think it should really be 
evaluated against <None>, seeing as that is the default <master> keyword 
argument value for most widgets. I ran into problems with this when making a 
container widget class that inherited from the <Canvas>, then implementing the 
<__len__> magic method. When the length was zero the widget would evaluate as 
false, which would prevented me from packing widgets inside my container widget.

I attached a revised version of the method.

----------
components: Tkinter
files: tkbugfix.py
messages: 165070
nosy: Drew.French
priority: normal
severity: normal
status: open
title: Minor revision to the <BaseWidget._setup> method in Tkinter
type: behavior
versions: Python 2.7
Added file: http://bugs.python.org/file26326/tkbugfix.py

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<http://bugs.python.org/issue15303>
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