Namespaces: memory vs 'pollution'

[Ethan Furman]

On 07/22/2019 07:27 PM, DL Neil wrote:

> NameError conveys nothing to the user.
> PythonVersionError is more communicative - and speaks volumes to 'us'.
> 
> The mainline code is something like:
> 
>      p = PythonEnvironment()
>      try:
>          p.compatibility( ...spec... )    # eg must be Py3 not 2.n
>      except PythonVersionError:
>          print( more illuminating errmsg )

This is why tests should check for the exact error raised, not that any error was raised.  (That testing bug bit me a couple times before I learned that lesson.)

--
~Ethan~