Install Virtual Environments & Requirements Packages

venv.md

0. Install pip

1. Virtual Environments

   1. Install the virtualenv package

      $ pip install virtualenv

   2. Create the virtual environment

      $ virtualenv env
      —————OR—————
      $ virtualenv -p /usr/bin/python2.7  virtualenv_name
      $ virtualenv -p /usr/bin/python3   virtualenv_name
      $ virtualenv -p python3 testproject
      —————OR—————
      python -m venv env       

   3. Activate the virtual environment

      • Mac OS / Linux

        $ source env/bin/activate

      • Windows

        $ env\Scripts\activate

   4. Deactivate the virtual environment

      (env) $ deactivate

2. Save Requirements Packages to file

   In order to keep your environment consistent, it’s a good idea to “freeze” the current state of the environment packages. To do this, run:

   $ pip freeze > requirements.txt
   

3. Install Requirements Packages

   $ pip install -r requirements.txt
   

Related Link

• Virtualenv (pypi) (pypa)
• Pipenv & Virtual Environments (python-guide)
• Installing Packages (python.org)