Installation error

[ladsantos]

When I tried to install costools from source, I got this error:

Running calcos-3.0/setup.py -q bdist_egg --dist-dir /var/folders/jp/y94kfdg15xjgpplw8yrqt3jc0000gn/T/easy_install-3xpdprnf/calcos-3.0/egg-dist-tmp-fkcknzz_
error: Setup script exited with error: each element of 'ext_modules' option must be an Extension instance or 2-tuple

I am using Anaconda Python 3 on macOS. I managed to circumvent the error by installing calcos from source before costools.

[parkusa]

I had this issue thrown, and a few others. Ultimatley for install this is what I did using a Windows operating system:

(1) Make a new folder for related packages, mine's named "STScI_Python_Tools"
(2) Open bash and navigate to the new folder
(3) In bash clone the git calcos and costools (in that order) using
-$git clone https://github.com/spacetelescope/calcos.git
-$git clone https://github.com/spacetelescope/costools.git
(4) Add this new folder to your python path lists. I use Spyder and did this:
- Spyder -> Tools -> Python Task Manager -> Add -> STScI_Python_Tools