IDLE WARNING: The version of Tcl/Tk (8.5.9) in use may be unstable
Feb 12, 2015
If you install the latest release of Python for Mac OS X 64-bit/32-bit and run IDLE, you may get an error like this one:
>>> WARNING: The version of Tcl/Tk (8.5.9) in use may be unstable. Visit http://www.python.org/download/mac/tcltk/ for current information.
Visit https://www.python.org/download/mac/tcltk/ and you’ll see:
Click on the Install link, which takes you to a page with these options:
This is where I went wrong initially. I downloaded and installed the 8.6 version, but I still got the error. Jason Briggs explains why here. Apparently, IDLE is looking for the latest 8.5 version, so the one to download is the one I circled above.
Related Training: Python