Can't import Representation class twice (from different packages/telescopes)

I try to import two functions from two packages of two telescopes (CTA / FACT). Both define a PlanarRepresentation class internally.

Error:

    438         if repr_name in REPRESENTATION_CLASSES:
    439             raise ValueError("Representation class {0} already defined"
--> 440                              .format(repr_name))
    441 
    442         REPRESENTATION_CLASSES[repr_name] = cls

ValueError: Representation class planar already defined

MWE without the packages, but same Error, basically just redefining the Representation class:

from astropy.coordinates import BaseRepresentation

class PlanarRepresentation(BaseRepresentation): 
     attr_classes = ['a', 'b'] 
     def __init__(self, x, y, copy=True, **kwargs): 
         pass

class PlanarRepresentation(BaseRepresentation): 
     attr_classes = ['a', 'b'] 
     def __init__(self, x, y, copy=True, **kwargs): 
         pass

[mhvk]

The use case is arguably mostly laziness: if you want to initialize or convert, you don’t have to import the relevant class, but just give its name.

So, indeed, changing the name of your class would resolve it, though I think that longer term it still seems reasonable to move the class up to astropy.

[mhvk]

Could you explain why or when this would be useful?

Well, it certainly is not something we can change any more; it is even in the Getting Started section on coordinates; http://docs.astropy.org/en/latest/coordinates/index.html#representation