2. use virutal env and find what is the difference

erp@erp-Inspiron-N5110:~/tutorial$ source env/bin/activate
(env)erp@erp-Inspiron-N5110:~/tutorial$


so when i activate the virutal environement ie., env with the commmand ie., source env/bin/activate(ie., source to active is env/bin/activate )


and we can see the env which i highlight with the red color.....



so it means that it is in virtual environement.  fine...