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We present a new public Python package, DarkHistory, for computing theeffects of dark matter annihilation and decay on the temperature and ionizationhistory of the early universe. DarkHistory simultaneously solves for theevolution of the free electron fraction and gas temperature, and for thecooling of annihilation/decay products and the secondary particles produced inthe process. Consequently, we can self-consistently include the effects of bothastrophysical and exotic sources of heating and ionization, and automaticallytake into account backreaction, where modifications to theionization/temperature history in turn modify the energy-loss processes forinjected particles. We present a number of worked examples, demonstrating howto use the code in a range of different configurations, in particular forarbitrary dark matter masses and annihilation/decay final states. Possibleapplications of DarkHistory include mapping out the effects of dark matterannihilation/decay on the global 21cm signal and the epoch of reionization, aswell as the effects of exotic energy injections other than dark matterannihilation/decay. The code is available athttps://github.com/hongwanliu/DarkHistory with documentation athttps://darkhistory.readthedocs.io . Data files required to run the code can bedownloaded at https://doi.org/10.7910/DVN/DUOUWA .

DarkHistory: A code package for calculating modified cosmic ionization and thermal histories with dark matter and other exotic energy injections