In [1]: from astropy.io import fits

In [2]: hdu_list = fits.open('test.fits')
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-29c6c8a8af01> in <module>()
----> 1 hdu_list = fits.open('test.fits')

/usr/lib64/python3.6/site-packages/astropy/io/fits/hdu/hdulist.py in fitsopen(name, mode, memmap, save_backup, cache, lazy_load_hdus, **kwargs)
    149 
    150     return HDUList.fromfile(name, mode, memmap, save_backup, cache,
--> 151                             lazy_load_hdus, **kwargs)
    152 
    153 

/usr/lib64/python3.6/site-packages/astropy/io/fits/hdu/hdulist.py in fromfile(cls, fileobj, mode, memmap, save_backup, cache, lazy_load_hdus, **kwargs)
    388         return cls._readfrom(fileobj=fileobj, mode=mode, memmap=memmap,
    389                              save_backup=save_backup, cache=cache,
--> 390                              lazy_load_hdus=lazy_load_hdus, **kwargs)
    391 
    392     @classmethod

/usr/lib64/python3.6/site-packages/astropy/io/fits/hdu/hdulist.py in _readfrom(cls, fileobj, data, mode, memmap, save_backup, cache, lazy_load_hdus, **kwargs)
   1062 
   1063         # Make sure at least the PRIMARY HDU can be read
-> 1064         read_one = hdulist._read_next_hdu()
   1065 
   1066         # If we're trying to read only and no header units were found,

/usr/lib64/python3.6/site-packages/astropy/io/fits/hdu/hdulist.py in _read_next_hdu(self)
   1137                                 fileobj.seek(offset, os.SEEK_SET)
   1138 
-> 1139                         hdu = _BaseHDU.readfrom(fileobj, **kwargs)
   1140                     except EOFError:
   1141                         self._read_all = True

/usr/lib64/python3.6/site-packages/astropy/io/fits/hdu/base.py in readfrom(cls, fileobj, checksum, ignore_missing_end, **kwargs)
    326         hdu = cls._readfrom_internal(fileobj, checksum=checksum,
    327                                      ignore_missing_end=ignore_missing_end,
--> 328                                      **kwargs)
    329 
    330         # If the checksum had to be checked the data may have already been read

/usr/lib64/python3.6/site-packages/astropy/io/fits/hdu/base.py in _readfrom_internal(cls, data, header, checksum, ignore_missing_end, **kwargs)
    462                     del new_kwargs[key]
    463 
--> 464         hdu = cls(data=DELAYED, header=header, **new_kwargs)
    465 
    466         # One of these may be None, depending on whether the data came from a

/usr/lib64/python3.6/site-packages/astropy/io/fits/hdu/groups.py in __init__(self, data, header)
    275         if len(self._axes) <= 0:
    276             self._axes = [0]
--> 277             self._header['NAXIS'] = 1
    278             self._header.set('NAXIS1', 0, after='NAXIS')
    279 

TypeError: '_BasicHeader' object does not support item assignment