Interfacing Gaudi with Python Objectives
8 Interfacing Gaudi with Python Gaudi Framework Tutorial, 2004 Objectives After completing this lesson, you should be able to: • Understand how Gaudi is interfaced to Python • Convince you that Python is a very good programming language for Rapid Prototyping • Write simple Python scripts to access LHCb data 8-2 Gaudi Framework Tutorial, 2004 Python Language Python is an Open Source programming language created by Guido van Rossum. While it has been available since 1990, it has recently seen a dramatic increase in popularity in a wide variety of domains Python is simple, elegant, powerful and reliable Features: • Variables & Arithmetic expressions • String manipulations • Conditionals (if/else statements), Loops (for/while) • Functions, Lists, Dictionaries, Classes (Objects), Exceptions , Modules 8-3 Gaudi Framework Tutorial, 2004 Why Python? Free, Open-Source, Maintainable Cross-Platform, Portable General-Purpose, High-level, Object-Oriented Interpreted • However it is quite fast (byte code idea from Java) Dynamically typed, Introspective • Not need to declare any variable Simple syntax, Robust • Emphasis by the author to minimize typing Variety of Shells Powerful built-in types and modules Î Ideal for Scripting and Prototyping 8-4 Gaudi Framework Tutorial, 2004 Python as a “Glue” Extension Modules • Very easy to interface to C++ classes (C-API) Collaborative • Extension modules can be plugged and used together Very rich set LHC modules specialized generic modules Several GUI toolkits EDG API PVSS XML Database GUIGUI Python shell JPE PyROOT gaudipython mathmath Gateways to other frameworks Java Root Gaudi Very rich set Classes Classes Framework of Python standard 8-5 Gaudi Framework Tutorial, 2004 modules Python Binding Techniques Python provides a very complete C-API • By hand bindings are possible but even for medium-sized projects, it becomes cumbersome and unmaintainable.
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