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Space Telescope Science Institute

PyRAF is a command language for running IRAF tasks that is based on the Python scripting language. It gives users the ability to run IRAF tasks in an environment that has all the power and flexibility of Python. PyRAF can be installed along with an existing IRAF installation; users can then choose to run either PyRAF or the IRAF CL.

PyRAF is a product of the Science Software Branch at the Space Telescope Science Institute.

For the latest HST data reduction software and tools, we recommend using the HST data reduction handbooks and the Astronconda package for the most up to date information.

Due to reduced budgets for HST, we can only provide minimal Pyraf support. If you have a problem that cannot be solved quickly by our first tier support, we may be unable to help. This is unfortunate, but it is the best we can do with the resources available.

Release Installation

To download and install the current release version of PyRAF please see instructions on the Astroconda page: http://astroconda.readthedocs.io/en/latest/.

Development Installation

To download and install the latest development version of PyRAF follow these steps. Please only use this version if you have been directed by an STScI representative to do so: