should i use a virtual environment python code example

Example 1: virtual env create python

#------FOR LINUX/MAC---------#
#installing venv 
sudo apt-get install python3.6-venv
#creating virtual env
python3 -m venv env
#activating virtual env
source env/bin/activate


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

Example 2: virtual env in python

pip install --user virtualenv
py -m venv env
.\env\Scripts\activate

Example 3: virtual env in python

python3 -m venv tutorial-env

Example 4: python virtual env

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

Example 5: activate virtual environment python

tutorial-env\Scripts\activate.bat