Ned Deily <n...@python.org> added the comment:

That message just means that Python terminated with an error; the specific 
traceback is lost.

But I just noticed one possible explanation. It appears that if the Files & 
Folder security setting is set to disallow access to your Documents Folder, 
IDLE.app will fail on startup but it will launch from the command line. Check 
the following in System Preferences.

Apple Menu (upper left corner) -> System Preferences -> Security & Privacy.
Then click on the Privacy tab, scroll to and click on Files and Folders, then 
look for a Python.app (not IDLE.app) entry.  It should have a Documents Folder 
entry underneath it and it should be checked (enabled). If not, click it (you 
might need to click on the lock in the lower left corner to enable changes).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39927>
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