CDS units are not the same as regular units #7751

Activity

1. taldcroft

   added

   units

   Bug

   on Aug 21, 2018
2. kyleaoman commented on Aug 21, 2018

   

   kyleaoman

   on Aug 21, 2018

   Last edited by kyleaoman

   Contributor

   More actions

   Hm, this is even more complicated than it appears at first. Enabling cds units helps somewhat:

   >>> import astropy.units as u
   >>> u.Unit('s') is u.Unit('s', format='cds')
   False
   >>> import astropy.units.cds
   >>> with astropy.units.cds.enable():
   ...     u.Unit('s') is u.Unit('s', format='cds')
   ... 
   True
   
   

   but not entirely:

   >>> u.Unit('s') is u.s
   True
   >>> u.Unit('s', format='cds') is u.s
   False
   >>> with astropy.units.cds.enable():
   ...     u.Unit('s', format='cds') is u.s
   ... 
   False
   

   which implies the very confusing:

   >>> u.Unit('s') is u.s
   True
   >>> with astropy.units.cds.enable():
   ...     u.Unit('s') is u.s
   ... 
   False
   
3. astrofrog

   added

   needs-reconfirmation

   on Oct 21, 2025