[Python-Dev] Re: 2.2 features

[François Pinard]

[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  Has it been
retracted?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! :-)


Python 2.3.2 (#1, Nov  9 2003, 20:14:22) 
[GCC 3.3 20030226 (prerelease) (SuSE Linux)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
from __future__ import nested_scopes, generators, division
del __future__, fcntl, termios, joined, character, nested_scopes, generators, division
sys.ps1 = '>>> '
from __future__ import nested_scopes, generators, division
del __future__, fcntl, termios, joined, character, nested_scopes, generators, division
sys.ps1 = '>>> '
>>> 0 in int
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: iterable argument required
>>> isinstance(0, int)
True
>>> int
<type 'int'>
>>> 



-- 
François Pinard   http://www.iro.umontreal.ca/~pinard