how to make virtualenv in python code example

Example 1: python virtual environment

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

source env/bin/activate

#all this is on same directory

Example 2: create a virtualenv python

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

Example 3: python create virtualenv

pip install virtualenv # install first
cd projectfolder # go to project folder
python -m venv ./venv # Create a virtual environment named venv
Activate.ps1 # (powershell) start the file  to start the environment
activate.bat # (cmd) start the file  to start the environment
# if it worked you'll see a (venv) in front of your cursor path

Example 4: python virtual environment

source env/bin/activate