New issue 932: No warning when astropy isn't installed when trying to load fits data https://bitbucket.org/yt_analysis/yt/issue/932/no-warning-when-astropy-isnt-... Jill Naiman: Reporting Version: 1e0faa5cb0fc+ (yt) tip When trying to load fits data (just your usual load command), I get an error like "Supplied ('/Users/jillnaiman/data/grs-50-cube.fits',) {}, but could not load!" when the file is clearly there. Its fixed by "pip install astropy", but there is no warning that this package needs to be installed for the fits loading to work.