PyKEP is a scientific library providing basic tools to perform research in interplanetary trajectory design or, more in geeral in mission analysis. Algoritmic efficiency is a main focus of the library, which is written in C++ and exposed to Python using the boost::python library. At the library core is the implementation of an efficient solver for the multiple revolutions Lambert’s problem, objects representing the Sims-Flanagan low-thrust model, efficient keplerian propagators, Taylor-integrators and more ...
Check the official documentation at http://esa.github.io/pykep/