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Virtual environments

virtualenvwrapper

Installation

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# Make sure you have pip installed.
sudo apt-get install python3-pip

# Installing virtualenvwrapper 
sudo pip3 install virtualenvwrapper

# Open bashrc by –
sudo gedit ~/.bashrc

# After opening it, add the following  lines to it :

export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=$HOME/Projects
source /usr/share/virtualenvwrapper/virtualenvwrapper.sh

Basic usage

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# Creating a virtual environment with mkvirtualenv
mkvirtualenv nameOfEnvironment

# List exisiting environment in your 
lsvirtualenv -b

# Work on an environment
workon nameOfEnvironment

# Close current environment
deactivate

# Delete virtual environment
rmvirtualenv nameOfEnvironment

# To work on another version of python:
mkvirtualenv -p python3.x venv_name
# You will see something like this: (venv_name)

Backing up virtual environment before removing it:

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pip freeze > requirements.txt

venv

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python3 -m venv <DIR>
source <DIR>/bin/activate

Now you can activate or deactivate the virtual environment with:

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<DIR>\Scripts\activate

pyenv

Install prerequisites: Ensure you have the required dependencies for pyenv installation.

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sudo apt update sudo apt install -y build-essential libssl-dev zlib1g-dev libbz2-dev \ libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \ xz-utils tk-dev libffi-dev liblzma-dev python3-openssl git

Install pyenv: Use the following commands to install pyenv:

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curl https://pyenv.run | bash

Update .bashrc to set up pyenv: Add the following to your .bashrc (or .zshrc if using zsh):

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export PATH="$HOME/.pyenv/bin:$PATH"
eval "$(pyenv init --path)"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

Then, reload your shell configuration:

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pyenv install 2.7.18

This command installs Python 2.7.18, or you can choose another Python 2.7 version if needed.

Create a Python 2.7 virtual environment: Once Python 2.7 is installed, you can create a virtual environment with:

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pyenv virtualenv 2.7.18 env_name

Activate the virtual environment: To activate the environment, run:

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pyenv activate env_name

Or deactivate:

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deactivate
Last update: 2025-02-02
Created: February 29, 2024 15:15:09