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Maybe my diagnosis is off. When I install (a non-framework) Python from the 
source, I don't use sudo, I just do "make install". In that case all files are 
owned by me. The installer however installs everything as root, and with the 
files being not group writable it means that I (even as an admin) can't move/
overwrite/delete the files without using sudo or changing the permissions.

I would expect to be able to have write permissions to the installed files if 
I'm an admin user. Don't know how to fix that easily, either.