IDLE on Mac Error No. 13

[leemc71]

I just installed IDLE with interpreter v. 3.71 on my Mac running the latest Mojave OS. I did not change any of the default installation options. When I initially create a new .py file in IDLE it saves fine. However, when I edit the file and attempt to re-save it, I get "[Errno 13] Permission denied" message followed by the path to the file. I am baffled why this happens, especially with a default installation. (I have also run the same version of IDLE on a PC with no problems.)

Can anyone please enlighten me as to what the problem is and what the fix may be?

Thanks,
Lee

[Larz60+]

IDLE is on the low end of available IDE's. I don't know why it's still part of the python package.
There are a lot better choices.
Top of the list are VSCode and PyCharm community edition (full blown, but no change for non commercial use).
VSCode on all major OS including Mac and OS-X
there is an install tutorial here: https://python-forum.io/Thread-VS-Code-from-start