lenstronomy is an Astropy-affiliated Python package for gravitational lensing simulations and analyses. lenstronomy is originally introduced by @lenstronomy1 and is based on the linear basis set approach by Birrer et al. 2015. The user and developer base of lenstronomy has since substantially grown and the software has become an integral part of a wide range of recent analyses, such as measuring the Hubble constant with time-delay strong lensing or constraining the nature of dark matter from resolved and unresolved small scale lensing distortion statistics. The modular design has allowed the community to incorporate innovative new methods, as well as to develop enhanced software and wrappers with more specific aims on top of the lenstronomy API. Through the community engagement and involvement, lenstronomy has become a foundation of an ecosystem of affiliated packages extending the original scope of the software and proving its robustness and applicability at the forefront of the strong gravitational lensing community in an open source and reproducible manner.

release for the JOSS submission