Python is now widely used in physics analysis. To start with we recommend to visit Python homepage http://www.python.org. Besides there are few documents written at CERN in order to show how Python is being used for solving problems in modern physics analysis.
Python Manuals & Tutorials Presentations
LoKi is a C++ toolkit for the simple and user-friendly data analysis. All information about it and its usage in LHCb you can find on LoKi-pages
The Gaudi project is a open project for providing the necessary interfaces and services for building HEP experiment frameworks in the domain of event data processing applications. All information about it and its usage in LHCb you can find on Gaudi pages