How to set up a virtual environments using conda for the Anaconda Python distribution
A virtual environment is a named, isolated, working copy of Python that that maintains its own files, directories, and paths so that you can work with specific versions of libraries or Python itself without affecting other Python projects. Virtual environmets make it easy to cleanly separate different projects and avoid problems with different dependencies and version requiremetns across components. The `conda` command is the preferred interface for managing intstallations and virtual environments with the Anaconda Python distribution. If you have a vanilla Python installation or other Python distribution see `virtualenv`.
1. Check conda is installed and in your PATH
Open a terminal client.
conda -V into the terminal command line and press enter.
If conda is installed you should see something like the following.
$ conda -V conda 3.7.0
2. Check conda is up to date
conda update conda
3. Create a virtual environment for your project
In the terminal client enter the following where
yourenvname is the name you want to call your environment, and replace
x.x with the Python version you wish to use.
(To see a list of available python versions first, type
conda search "^python$" and press enter.)
conda create -n yourenvname python=x.x anaconda
4. Activate your virtual environment
To activate or switch into your virtual environment, simply type the following where
yourenvname is the name you gave to your environement at creation.
source activate yourenvname
5. Install additional Python packages to a virtual environment
To install additional packages only to your virtual environment, enter the following command where
yourenvname is the name of your environemnt, and
[package] is the name of the package you wish to install. Failure to specify
-n yourenvname will install the package to the root Python installation.
conda install -n yourenvname [package]
6. Deactivate your virtual environment
To end a session in the current environment, enter the following. There is no need to specify the envname - which ever is currently active will be deactivated, and the
PATH and shell variables will be returned to normal.
7. Delete a no longer needed virtual environment
To delete a conda environment, enter the following, where
yourenvname is the name of the environment you wish to delete.
conda remove -n yourenvname -all
If you want to work without
conda you can work directly with
python3-venv module allows us to create lightweight virtual environments with their own site directories, optionally isolated from system site directories. Given that, we will be able to run multiple Python 3 environments with varying dependencies on the same computer.
1. Create a virtual environment for your project
python3 -m venv ~/yourenvname
2. Activate your virtual environment
In order to get into your Python 3 virtual environment with your terminal window, you need to run the
3. Install additional Python packages to a virtual environment
After the command complete, you will find that your terminal prompt is appended with (yourenvname). While inside this virtual environment, you can install any Python dependencies with the
pip install [package]
4. Deactivate your virtual environment
In order to get out of your Python 3 virtual environment, run: