Astroquery: sha.query raises ValueError

[prajwel]

Hi,

While using Astroquery, I came across the following error. Other coordinates that I have tried seems to work without any problem.

from astroquery import sha
sha.query(ra = 219.57741, dec = 64.171525, size = 0.001)

---

ValueError Traceback (most recent call last)
in
----> 1 sha.query(ra = 219.57741, dec = 64.171525, size = 0.001)

~/.local/lib/python3.8/site-packages/astroquery/sha/core.py in query(coord, ra, dec, size, naifid, pid, reqkey, dataset, verbosity, return_response, return_payload)
145 # To table
146 # transpose data for appropriate table instance handling
--> 147 t = Table(list(zip(*data)), names=col_names, dtype=dtypes)
148 return t
149

~/.local/lib/python3.8/site-packages/astropy/table/table.py in __init__(self, data, masked, names, dtype, meta, copy, rows, copy_indices, **kwargs)
605 names = [fix_column_name(name) for name in names]
606
--> 607 self._check_names_dtype(names, dtype, n_cols)
608
609 # Finally do the real initialization

~/.local/lib/python3.8/site-packages/astropy/table/table.py in _check_names_dtype(self, names, dtype, n_cols)
827
828 if len(names) != n_cols or len(dtype) != n_cols:
--> 829 raise ValueError(
830 'Arguments "names" and "dtype" must match number of columns'
831 .format(inp_str))

ValueError: Arguments "names" and "dtype" must match number of columns

[bsipocz]

Thanks for the report.

it seems we have an empty return table which has zero number of columns and the parser cannot yet handle that.

[bsipocz]

I'm leaving it as package-novice issue, with the clear task to add a check for empty return in the following file, around this location. Have a NoResultsWarning insteand and grafully return an empy table. Similar warning and empty table return was done in https://github.com/astropy/astroquery/pull/1829/ .

:

> /Users/bsipocz/munka/devel/astroquery/astroquery/sha/core.py(147)query()
    145     # To table
    146     # transpose data for appropriate table instance handling
--> 147     t = Table(list(zip(*data)), names=col_names, dtype=dtypes)
    148     return t
    149 

ipdb> len(col_names)                                                                                                    
42
ipdb> data                                                                                                              
[]

[nandita11]

Hello @bsipocz . I am an outreachy applicant. Can I take this issue up?

[bsipocz]

Certainly, please go ahead.