CODEWITHSUNDEEP
pythondebianvirtualenvpython-3.6
nat
nat

Reputation: 23

Install python 3.6 virtualenv without modifying my python 3.5 installation

I use debian and I have python 3.5.3 installed. I am going to work on a project which requires python 3.6, but the last time I installed python 3.6 on my computer it broke a lot of things, so I would like to avoid that. What I want is to create a virtual environment which runs python 3.6, but without affecting my python 3.5 installation.

I know that the virtualenv command has an option to specify which python to use, but this would only work if I have a python 3.6 executable on my computer. Is there a way to install the virtualenv without having the python 3.6 executable installed ? If not, is it possible to install python 3.6 without getting rid of python 3.5 ?

In case you're wondering, this is the procedure I followed to install python 3.6, which broke a bunch of stuff. Since then I've re-installed my OS for other reasons, and now I'm back on python 3.5.

Upvotes: 2

Views: 2289

Answers (3)

Sreenath
Sreenath

Reputation: 23

Install supporting softwares

sudo apt update

sudo apt install software-properties-common

sudo add-apt-repository ppa:deadsnakes/ppa

sudo apt update

sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev wget

Download required python version in the /tmp directory

I'm assuming you are going to install Python 3.6.12

cd /tmp

wget https://www.python.org/ftp/python/3.7.5/Python-3.6.12.tgz

tar -xf Python-3.6.12.tgz

cd Python-3.6.12.tgz

Install python version

./configure --enable-optimizations --enable-loadable-sqlite-extensions

sudo make altinstall

Note

There are two ways to install python one is altinstall and the other one is install

altinstall is the preferred method since it will not overwrite the existing default python version

Now since you followed altinstall method, In the terminal, you can see multiple python versions

>> python --version
Python 2.7.18

>> python3.5 --version
Python 3.5.10

>> python3.6 --version
Python 3.6.12

Now to create virtual environment of version 3.6

cd ~/home/location/

python3.6 -m venv <virtual_environment_name>

source virtual_environment_name/bin/activate

Upvotes: 0

Orenshi
Orenshi

Reputation: 1873

I'm interested in knowing how else to do this. But I personally use conda.

You can create other Python environments without having to installing it first because it's included in the anaconda metapackage.

If you look at my default system you see that it's only Python 2 available. 

$ cd /usr/bin/ | ls | grep python
-rwxr-xr-x    1 root root       11224 Sep  1  2016 abrt-action-analyze-python
-rwxr-xr-x    1 root root        7136 May  3  2017 python2.7
lrwxrwxrwx    1 root root           9 Dec  9 13:27 python2 -> python2.7
lrwxrwxrwx    1 root root           7 Dec  9 13:27 python -> python2

If you have conda installed then you can use the below to create a venv, activate it, and then you see you're using a different Python that's not installed on your file system.

conda create -n py35 python=3.5 anaconda
$ source activate py35
py35 $ python --version
Python 3.5.3 :: Anaconda 4.4.0 (64-bit)

Upvotes: 1

bbqwings
bbqwings

Reputation: 131

Check out pyenv (https://github.com/pyenv/pyenv). After you install pyenv, you can use something like the following to install a specific python version:

pyenv install 3.6.4

Then you can use this python version with pyenv global, pyenv local, or pyenv virtualenv commands.

Upvotes: 3

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