Activate the virtual environment. 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 and activate virtual environment with python 3

$ python3 -m venv ~/.virtualenvs/djangodev
$ source ~/.virtualenvs/djangodev/bin/activate

Example 3: virtual environment python

#create new virtual environment
python3 -m venv /path/to/new/virtual/environment