python venv

python3 -m venv env
python -m virtualenv env #py2

source env/bin/activate

#all this is on same directory

# Create the virtual environment.
python -m venv venv

# Activate the env.
venv\Scripts\activate.bat

pip install virtualenv
cd projectfolder #go to project folder
virtualenv projectname #create the folder projectname 
source projectname/bin/activate

venv\Scripts\activate

python3 -m venv tutorial-env
#name : tutorial-env
tutorial-env\Scripts\activate 	#activate env
deactivate #deactivate env

python3 -m venv /path/to/new/virtual/environment

### VIRTUAL ENVIRONMENT 

pip install virtualenv

virtualenv pas # write the folder name 

.\foldername\Scripts\activate # to activate the virtual environment 

pip freeze # to get all the modules in the base interpretor / virtual env

pip freeze > requirements.txt # to set the modules and their versions in the requirement file 

pip install -r requirements.txt # to install all the modules with their respected versions in the virtual env

virtualenv --system-site-packages-foldername # this creates virtual env with all the modules and versions that are preinstalled on base python interpretor 

deactivate # to come out of the virtual env

python3 -m venv env

$ pip install virtualenv

python3 -m venv /path/to/new/virtual/environment