SHELL

python venv

# Ubuntu/Debian
apt-get install python3-venv
python3 -m venv .venv
source .venv/bin/activate

# python 2
python -m virtualenv env

venv python

python3 -m venv env    # create env
source env/bin/activate    # activate env
deactivate    # deactivate env
rm -r env/    # delete env in Linux
pip freeze    # show all packages installed
pip install -r requirements.txt   # install all packages
pip freeze > requirements.txt    # create automatically requirements.txt

pyton venv

python -m venv newVirtualEnv				//create new virtual env
source newVirtualEnv/bin/activate  			//activate-lunix|unix
./newVirtualEnv/Scripts/activate.ps1 			//activate-Windows powershell
./newVirtualEnv/Scripts/activate.bat 		//activate-Windows cmd
cd newVirtualEnv/Scripts && . activate		//activate-Windows git bash:
  
//--Windows Execution_Policies error--
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

// check if using venv active - CLI does not have (newVirtualEnv) 
pip -V

python venv

#------FOR LINUX/MAC---------#
sudo apt-get install build-essential libssl-dev libffi-dev python-dev #installing requirements
sudo apt-get install -y python3-venv #installing venv 
python3 -m venv env #creating virtual env
source env/bin/activate #activating virtual env


#-------FOR WINDOWS----------# 
py -m pip install --user virtualenv #installing venv
py -m venv env #creating virtual env
.envScriptsactivate #activating virtual env

python venv

### install virtualenvwrapper ###
pip install virtualenvwrapper-win
### Add an environment variable WORKON_HOME to specify the path to store environments. By default, this is %USERPROFILE%Envs. ###

### ↓↓↓ use cmd or cmder (don't use ps terminal) for any of the following commands ↓↓↓ ###

### list venvs ###
lsvirtualenv

### create venv (automatically activated after creation) ###
mkvirtualenv <name>

### remove venv ###
rmvirtualenv <name>

### activate venv ###
workon <name>

### deactivate venv ###
deactivate


### General Syntax ###
mkvirtualenv [-a project_path] [-i package] [-r requirements_file] [virtualenv options] <name>

python virtual env

$ pip install virtualenv

python virtualenv

python -m venv my_env
source my_env/bin/activate

python virtualenv

python -m venv my_env

python virtualenv venv

python -m venv venv

virtualenv --python

virtualenv venv --python=python3.10

#you can change python version (eg. python3.10) , Folder name (eg. venv)

python virtual env

$ virtualenv --version

python virtual env

$ source venv/bin/activate

python venv

python -m venv flask_env  # Creating an isolated environment
source flask_env/bin/activate # Activate virtual environment
deactivate #deactivate

python virtual env

$ cd project_folder
$ virtualenv venv

python virtual env

$ virtualenv -p /usr/bin/python2.7 venv

python venv

python3 -m venv tutorial-env
// start it 
source tutorial-env/bin/activate
// end it 
deactivate

python venv

source <folder-env>/bin/activate

python3 -m venv venv

$userenv = [System.Environment]::GetEnvironmentVariable("Path", "User")

[System.Environment]::SetEnvironmentVariable("PATH", $userenv + ";C:UsersAdminUbuntu", "User")

python virtual env

$ export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python2.7

python virtual env

$ pip install --user pipenv