[Python-Dev] Re: 2.2 features (original) (raw)

Guido van Rossum guido at python.org
Mon Jan 19 20:16:26 EST 2004

[Guido van Rossum] > Marcin 'Qrczak' Kowalczyk <qrczak at knm.org.pl> writes:

> > Now thow in 'isinstance' as an old way to spell a specific membership > > test (for types and classes) which doesn't have to be learned about > > at all. > I love it. 'x in type' as a shorthand for isinstance(x, type). > Checked into CVS! The above exchange is dated 2001-07-31, and I'm merely glancing over some old saved email. The above feature does not seem to be implemented in Python 2.3.2, as demonstrated by the script below. Has it been retracted? Not that I really need it, however! :-)

Yes, it was retracted. From the CVS log the next day:

revision 2.16.8.73 date: 2001/08/01 03:56:39; author: gvanrossum; state: Exp; lines: +1 -21 Rip out again the 'x in type' support. Further newsgroup discussion showed it was confusing. E.g. people tried "if x in [int, long]: ...".

In retrospect I think it was too cute...

--Guido van Rossum (home page: http://www.python.org/~guido/)

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