Python(x,y) is a handy scientific and engineering development application specially designed for numerical computations, data analysis and data visualization. It is based on Python programming language, Qt graphical user interfaces, Eclipse integrated development environment and Spyder interactive scientific development environment. With Python(x,y), one can do: Interactive calculations including for example 2D and 3D plotting or symbolic maths, Simple functionnal programming (with MATLAB-like syntax) as well as powerful object-oriented programming, Scientific projects development from the simplest script to the most sophisticated application thanks to Qt development framework and Spyder development environment, Parallel computing on multicore/processors computers or even clusters (with Parallel Python)