How to create virtual environment for python 3.7.0? - linux

Question

I'm able to install it with root user but I wanted to install it in a clean environment. My use case is to test the installation of another application with pip for the customer who is using python3.7.0
sudo apt-get update
sudo apt-get install build-essential libpq-dev libssl-dev openssl libffi-dev zlib1g-dev
sudo apt-get install python3-pip python3-dev
sudo apt-get install python3.7
Thanks.

Answer 1

(assuming python3.7 is installed)
Install virtualenv package:
pip3.7 install virtualenv
Create new environment:
python3.7 -m virtualenv MyEnv
Activate environment:
source MyEnv/bin/activate

Answer 2

To help anyone else who runs into the chicken & egg situation trying to use the above chosen answer, here's what solved it for me:
sudo apt install python3.7-venv
python3.7 -m venv env37
source env37/bin/activate
deactivate (when done using the environment)
I had installed python 3.7 using deadsnakes vs source:
sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.7
In doing so I could run python3.7 --version but since I had no pip3.7 I could not install virtualenv as directed in the solution above. Luck would have it that deadsnakes has venv! Once I installed venv I could create my environment & be on my merry way
Handy official python page with venv info
So why didn't I use?:
python3.7 -m ensurepip
That was giving me:
ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/usr/local/lib/python3.7/dist-packages/easy_install.py'
Consider using the --user option or check the permissions.
Which left me with 3 choices:
use sudo (which is simple but I keep being told is frowned upon)
install with --user option which wasn't ideal in that I may not always be logged in as the same user
or install it in an environment which I'm told is the recommended route.
But see chicken egg above.. How do I install pip in environment when I can't create venv or virtualenv? Thus my workaround solution of installing venv from deadsnakes which allowed me to create the virtual environment to then install pip3.7:
(env37) user#ubuntu:~$ python3.7 -m ensurepip
(env37) user#ubuntu:~$ pip3.7 --version
pip 19.2.3 from /home/user/env37/lib/python3.7/site-packages/pip (python 3.7)

Answer 3

Some added information, if you are trying for some version like python 3.7.10, which might give following error upon executing pip3.7.10 install virtualenv
.pyenv/versions/3.7.10/bin/python: No module named virtualenv
So, in a general sense you can do the following steps:
[commands are specific to MacOs, I am currently using with the new M1 chip]
After installing 3.7.10 using pyenv, make it global.
brew update
brew install pyenv
set environment variables
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(pyenv init -)"' >> ~/.bash_profile
source ~/.bash_profile
look at the pyenv list to see if the version you install is there or not and install and make it global
pyenv install --list
pyenv install 3.7.10
pyenv global 3.7.10
create your virtual environment now with this version
python -m venv MyEnv
activate it
source MyEnv/bin/activate

Answer 4

Using pip on windows, you can do the following:
1.virtualenv --python "C:\\Python37\\python.exe" venv# use your own path
You will see something like this:
Running virtualenv with interpreter C:\Python37\python.exe
Using base prefix 'C:\Python37'
New python executable in C:\Users\XXXX\Documents\GitHub\MyProject\venv\Scripts\python.exe
Installing setuptools, pip, wheel...
done.
2.C:\Users\XXXXX\Documents\GitHub\MyProject>cd venv
C:\Users\XXXXX\Documents\GitHub\MyProject\venv>cd Scripts
C:\Users\XXXXX\Documents\GitHub\MyProject\venv\Scripts>activate.
At the beginning of the command path, when you see (environment variable name) in this case (venv), this is a sign that your virtual environment is activated.
(venv) C:\Users\tuscar2001\Documents\GitHub\MyProject\venv\Scripts>
Please check the following link for more details:http://www.datasciencetopics.com/2020/03/how-to-set-up-virtual-environment-in.html

Answer 5

Figure out python3.7 path on your system. For mac with python3.7 in brew you can use the following
virtualenv env -p /usr/local/opt/python#3.7/bin/python3
source ./env/bin/activate