• http://stackoverflow.com/questions/31907122/extend-an-instance-at-runtime
• http://stackoverflow.com/questions/6558765/how-do-you-see-the-entire-command-history-in-interactive-python

• http://docs.python-guide.org/en/latest/dev/virtualenvs/

• sudo pip install virtualenv
  cd my_project_folder
  virtualenv venv           #erstellt einen Ordner und laedt Programmierumgebung
  source venv/bin/activate
  deactivate                #verlaesst die virtuelle Umgebung

• sudo easy_install pip

• http://stackoverflow.com/questions/2705964/how-do-i-extend-a-python-module-python-twitter
• http://blog.thedigitalcatonline.com/blog/2014/05/19/method-overriding-in-python/#.WH0yTRRRFjA
• http://stackoverflow.com/questions/1006169/how-do-i-look-inside-a-python-object
• https://docs.python.org/2/library/inspect.html

python override a method that is called by a module

• http://stackoverflow.com/questions/23646826/python-how-to-override-a-method-defined-in-a-module-of-a-third-party-library
• http://stackoverflow.com/questions/5626193/what-is-a-monkey-patch