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Create virtual environment for different Python versions using Conda

In our earlier article, we had shown how to install multiple versions of python without breaking System tools and Create an Isolated environment using Virtualenv?. Here’s an another method to create virtual environment for different versions of Python – using Conda.

Conda is an open-source package management system and environment management for any language such as Python, Ruby, R, Lua, Scala, Java, C/C++, Fortran. Conda easily creates, saves, loads and switches between environments. So if you need to execute an application or a program that requires different version of Python, then Conda helps to do that.

How to install Conda Package Management System

There are two ways to install Conda.

  • The fastest way is to install Miniconda, a mini-version of Anaconda that includes only Conda and its dependencies.
  • Need Conda and 720+ open source packages, then install Anaconda.

We recommend you to install Anaconda. An advantage of Anaconda is, it does not require administrator privileges.

How to install Anaconda – Package Management system

Step 1: Install Prerequisites

#apt-get install libgl1-mesa-glx libegl1-mesa libxrandr2 libxrandr2 libxss1 libxcursor1 libxcomposite1 libasound2 libxi6 libxtst6

Step 2: Download the Anaconda Installer for Linux

You can download Anaconda installer for Linux depending on your Python version. Of late Anaconda is supporting 64-bit version of Linux. Make sure you are running 64-bit OS and not 32-bit.

Step 3: Run Anaconda Installer

Once you have downloaded the Anaconda installer, run it on your terminal using the below command:

#bash Anaconda3-2019.07-Linux-x86_64.sh

Follow the prompts on the installer screens.

Include the bash command regardless of whether or not you are using Bash shell.

The installer prompts “Do you wish the installer to initialize Anaconda3 by running Conda init?” We recommend “yes”.

Upon successful installation, close and open the terminal to take effect.

Verify the Conda

$conda -V

Create a Virtual Environment for your project

To use a particular Python version for your Virtual Environment, first search the list of available python versions using the below command:

$conda search "^python$"

This will list all python versions. You can select the particular version for your virtual environment by replacing the x.x with the version you require in the below command:

$conda create -n name_of_the_env python=x.x anaconda

Press Y to proceed. This will install the Python version and all the associated anaconda package libraries at the path you specify during the environment creation.

Activate your Virtual Environment

Once you create the virtual environment, you need to activate it by simply executing the below command with your environment name to switch to your virtual environment.

$conda activate name_of_the_env

How to install additional Python packages to your Virtual Environment

You can install additional Python packages to your virtual environment using the below command:

$conda install -n name_of_the_env [package]

De-activate your Virtual Environment

You can de-activate your virtual environment to end the session.

$conda deactivate

No need to specify the environment name. The current active environment will be deactivated.

List all virtual environments

You can get a list of all virtual environments using the below command:

$conda env list

Active environments is shown with *

Delete a non-required Virtual Environment

You can delete a virtual environment  which is no longer needed using the below command:

$conda remove -n name_of_the_env -all

Refer this cheat sheet for more conda commands.

Updated on August 29, 2019

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