On a machine running Debian stretch I have installed python3, which is currently python3.5. Nothing of python3.4 is present. But in /usr/local/lib/python3.4/dist-packages/ a number of packages is still installed. Probably, these have been installed using pip3 when python3.4 was current. Now, it seems pip3 isn't able to remove packages from that old directory. Is it safe to just rm -r /usr/local/lib/python3.4? urs