This code reproduces all the results presented in the article Core Imaging Library Part I: a versatile python framework for tomographic imaging by Jakob S. Jørgensen, Evelina Ametova, Genoveva Burca, Gemma Fardell, Evangelos Papoutsellis, Edoardo Pasca, Kris Thielemans, Martin Turner, Ryan Warr, William R. B. Lionheart, and Philip J. Withers which will be available from 5 July 2021 at https://doi.org/10.1098/rsta.2020.0192 A preprint is available from arXiv: https://arxiv.org/abs/2102.04560 Instructions are available in the file README.md as well as at the source GitHub repository https://github.com/TomographicImaging/Paper-2021-RSTA-CIL-Part-I