[Python-Dev] NoneType(None) raises exception (original) (raw)

Ethan Furman ethan at stoneleaf.us
Fri Apr 26 01:09:41 CEST 2013

We just fixed NoneType() to return None instead of raising an exception.

Another use-case for calling NoneType is working with ORMs:

result = [] for field in row: type = get_type(field) # returns int, bool, str, NoneType, ... result.append(type(field))

if field is None, the resulting call is NoneType(None), and since NoneType doesn't take any parameters we get an exception.

Is it worth filing a bug to have NoneType accept one optional argument, which defaults to None, and must be None, else raise an exception?

Or should it be:

class NoneType: def new(cls, *args, **kws): return None

Which is basically what my 2.x none() helper function does...

-- ~~Ethan~~