Ned Deily added the comment:

On OS X, the actions associated with trackpad gestures are controlled by the 
Trackpad panel of System Preferences.  The default settings map the "pinch with 
two fingers" gesture to "Zoom in or out" which Tk apps see as Mousewheel 
events: no programming needed!

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21933>
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