[issue989712] Support using Tk without a mainloop

[Daniel Diniz]

Changes by Daniel Diniz <ajaksu at gmail.com>:


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components: +Tkinter
dependencies: +IDLE / PyOS_InputHook
stage:  -> test needed
type:  -> feature request
versions: +Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue989712>
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