Reinstall python 2.7.12 and python 3.5.2

python pip packages multiple-versions
Zero G picture Zero G · Feb 4, 2017 · Viewed 57.2k times · Source

Good evening,

today i messed up my laptop trying to install some packages for python 3.5.2. I tried to install the correct pip version but i missed something and now i can't install any package in both versions and i can't solve the problem. Is it possible to unistall the 2 versions (including all packages) and reinstall everything? I don't use Python 2.7.12 (but i'l like to have a clean version of it), i need python 3.5.2 with the correct pip version to install, for example, the packages NumPy, SciPy, matplotlib etc.

Thanks in advance,

J

Answer

Alex L picture Alex L · Feb 4, 2017

I'd highly recommend using virtualenv, and never modifying the system python, except to install pip and virtualenv if necessary.

As was alluded to above, many OSes count on having a working python2 in order to function.

So...

apt-get remove python3
apt-get install python3
pip3 install virtualenv
virtualenv -p python3 venv
. venv/bin/activate
# now you are in a nice python3 world, completely isolated from system python
# remember to say . venv/bin/python every time you do anything
# or you can even add it to your .bashrc

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