Introduction

Offline analysis software for LCLS data historically pass a few stages;

• myana – the first C-based package,
• pyana – python-based framework,
• psana – C++-based framework.
  Currently, features of both frameworks are combined together under the unified
• psana – framework, which works both with C++ and python modules.
  This new framework allows data processing using advantage of both C++ and python modules. However, there is no full backward compatibility between new psana framework and pyana modules. Original pyana modules would not work directly in psana, they need to be changed. In this note we discuss the difference between pyana and python-psana modules and present the references to documentation, which help to migrate from pyana to python-psana.