Flash
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Flask::

  Flask is a microframework for Python based on Werkzeug, Jinja 2 and good intentions.
  http://flask.pocoo.org/
  $> pip install Flask



Flask-SocketIO::

    Flask-SocketIO gives Flask applications access to low latency bi-directional 
      communications between the clients and the server. 
    The client-side application can use any of the SocketIO official clients libraries 
      in Javascript, C++, Java and Swift, or any compatible client 
      to establish a permanent connection to the server.
    $> pip install flask-socketio
    http://flask-socketio.readthedocs.io/en/latest/