Running OSX 10.9.1 on a Mac mini. I used Python 2.7.6 Mac OS X 64-bit/32-bit x86-64/i386 Installer, downloaded from http://www.python.org/download/, to install python with idle. I ran the Update Shell Profile.command in the Python 2.7 folder. Idle gives a warning on startup: >>> 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. According to that, I needed Tcl/Tk 8.5.15 or later (I have no experience with that package) I downloaded ActiveTcl220.127.116.11.297588-macosx10.5-i386-x86_64-threaded from ActiveState, but Idle gives the same error on startup. My goal is to learn python and pygame. I have successfully installed: pygame-1.9.1release-python.org-32bit-py2.7-macosx10.3 I'm not a new programmer, but I am new to python and inexperienced at Mac installs that go beyond double-clicking a single install file or dragging an icon into a folder (in other words, I haven't done anything like a build from the command line), but evidently I'm missing a step here. I'm also new to these forums and appreciate any suggestions. Thanks for your patience with these newbie questions.