Roger Serwy added the comment:

On Mac, which version of Tk are you using? IDLE is known to have problems on 
Mac with Tk. See

You can disable colorization with the undocumented Ctrl+/ key combination. Does 
the crash still occur with the colorizer disabled before opening the file?

I am unable to reproduce this bug on Arch Linux.

nosy: +ned.deily, serhiy.storchaka, serwy, terry.reedy

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