Cache problem

[ceb8]

I discovered when using the service astroquery.mast.Tesscut that if I manually delete my cache I can't call Tesscut again until I restart my python kernel. I haven't tried this with any other astroquery service that uses caching, so I can't be sure, but looking at the code it seems likely to be a problem in astroquery's caching code rather than Tesscut.

Version: bleeding edge (what was on master as of 3 Feb 2020).

To reproduce:

1. from astroquery.mast import Tesscut
2. Navigate to astroquery cache (/<home or whatever>/.astropy/cache/astroquery) and delete everything in it
3. Tesscut.get_sectors(coordinates="324.24368 -27.01029")

Traceback:

[bsipocz]

This may either be astroquery or upstream, astropy.

I'm cc-ing the upstream cache experts @pllim @aarchiba

[pllim]

@ceb8 , when you reproduce it, please give some code, traceback, and version info. Thanks!

[ceb8]

@pllim Will do. Unfortunately tesscut is down at the moment. 😛

[bsipocz]

#1634 meant to address this, reopen if it's not the case.