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List all installed pip
  pip3.5 freeze

Install pip virtual environment
  pip3.5 install virtualenv

Setup virtualenv
  virtualenv venv --python=python3.5
  
start virtualenv linux
  source venv/bin/activate
  
start virtualenv windows
  ./venv/Scripts/activate.bat
  

Stop virtualenv
  deactivate
  
Install library in this
  pip install Flask-RESTful