Proto-PEP: Overloadable Boolean Operators

[Michael Hudson]

aleaxit at yahoo.com (Alex Martelli) writes:

> greg <greg at cosc.canterbury.ac.nz> wrote:
>    ...
> > Python does not currently provide any '__xxx__' special methods
> > corresponding to the 'and', 'or' and 'not' boolean operators. In the
>    ...
> > There is no such difficulty in the case of 'not', however, and it
> 
> Indeed, that's what the strangely-named __nonzero__ special method does:
> it's invoked upon the 'not' operator and in no other case, 

Erm.  No.

>>> class C(object):
...  def __nonzero__(self):
...   print 'hi!'
...   return 1
... 
>>> if C(): pass
... 
hi!

Or do I misunderstand what you're saying?

Cheers,
mwh

-- 
  Arrrrgh, the braindamage!  It's not unlike the massively
  non-brilliant decision to use the period in abbreviations
  as well as a sentence terminator.  Had these people no
  imagination at _all_?                 -- Erik Naggum, comp.lang.lisp