#Creating virtual environment in Linux
$ sudo apt-get install python-pip
#Then install virtualenv
$ pip install virtualenv
#Now check your installation
$ virtualenv --version
#Create a virtual environment now,
$ virtualenv virtualenv_name
#After this command, a folder named virtualenv_name will be created. You can name anything to it. If you want to create a virtualenv for specific python version, type
$ virtualenv -p /usr/bin/python3 virtualenv_name
or
$ virtualenv -p /usr/bin/python2.7 virtualenv_name
#Now at last we just need to activate it, using command
$ source virtualenv_name/bin/activate
#Now you are in a Python virtual environment
#You can deactivate using
$ deactivate