why use a python environment code example

Example 1: create new python environment

py -m venv env

Example 2: how to activate python virtual environment

#open directory with terminal where you crated vertual environment
#example your venv name 
teamspirit:~$ cd visualscrapy
#teamspirit:~/visualscrapy$  <-- output
#Now type bellow command
source ./bin/activate
#(visualscrapy) teamspirit:~/visualscrapy$   <-- output