[IPython-dev] Strange property bug?

[Anand Patil]

Hi all,

Here's a script I called 'test.py':

---------------------------------

class A(object):

    c=1

    def fget(self):
        self.c=self.c+1
        print 'Adding 1 to c'

    b=property(fget)
   
M = A()

----------------------


 From the regular Python shell, the A class works as expected:

Python 2.5 (r25:51918, Sep 19 2006, 08:49:13)
[GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> from test import *
 >>> M.c
1
 >>> M.b
Adding 1 to c
 >>> M.c
2
 >>>


But in IPython, the fget function seems to get called twice:

IPython 0.8.0 -- An enhanced Interactive Python.
?       -> Introduction to IPython's features.
%magic  -> Information about IPython's 'magic' % functions.
help    -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.

In [1]: run test

In [2]: M.c
Out[2]: 1

In [3]: M.b
Adding 1 to c
Adding 1 to c

In [4]: M.c
Out[4]: 3

Any ideas?

Thanks,
Anand