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Last modified: 13 July 2020


Latest Updates

This document highlights important changes and additions to Sherpa functionality in the CIAO 4.12.1 Sherpa release.

Sherpa version for CIAO 4.12.1 was released on July 14, 2020. Sherpa in CIAO runs under Python 3.5 (when installed with ciao-install) or Python 3.7, 3.6, or 3.5 (when installed using the conda package manager). The full list of the Sherpa updates is given in the Release Notes. The major updates in this release include:


Help can be found either via Python's native help function (that is, Python docstrings), or with the ahelp command (which can be used from both the command line and within the Sherpa interactive environment.

The Python docstrings are the preferred way to access help on the Sherpa functions and models, since the ahelp files may not have been updated either to add new functions or models, or to reflect recent improvements.

If you spot any errors, or missing information, in the docstrings, please submit a pull request to fix it or report the problem.

A recent development for "standalone Sherpa" is the creation of the Sherpa documentation website. This provides on-line access to the Python docstrings, as well as general documentation on how to use Sherpa. It is aimed at users who want to use the more object-orientated interface provided by Sherpa rather than the functions from the sherpa.astro.ui module documented on this site, as well as not being tailored to CIAO users, but it is useful for the more advanced Sherpa users who want to use Sherpa in complex Python pipelines.

Bug Fixes

A full list of the bug fixes can be found on the CIAO 4.12.1 release notes page, or by viewing the changes made to the 4.12.1 release branch on GitHub.