[IronPython] Lambdas, properties and namespace leakage

[Martin Maly]

Thanks for a fun bug, Michael, just to clarify, this is using the IronPython 1.1 release, correct?

If it is of any consolation, this is the output from the IronPython 2.0 alpha where this no longer happens:

IronPython console: IronPython 2.0 (2.0.0.0) on .NET 2.0.50727.42
Copyright (c) Microsoft Corporation. All rights reserved.
>>> class X(object):
...     p2 = property(lambda self: 3)
...
>>> dir(X)
['__class__', '__delattr__', '__dict__', '__doc__', '__getattribute__', '__hash__', '__init__', '__module__', '__name__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__str__', '__weakref__', 'p2']

Martin

-----Original Message-----
From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
Sent: Friday, June 01, 2007 8:06 AM
To: Discussion of IronPython
Subject: [IronPython] Lambdas, properties and namespace leakage

Hello all,

Another fun one. If you use 'property' to wrap a lambda in a class
namespace then an extra name leaks into the class namespace (which
confused our documentation system).

CPython:
 >>> class X(object):
...  p2 = property(lambda self: 34)
...
 >>> dir(X)
['__class__', '__delattr__', '__dict__', '__doc__', '__getattribute__',
'__hash_
_', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__',
'__repr_
_', '__setattr__', '__str__', '__weakref__', 'p2']

Amongst all the detritus you can see 'p2' nestled there at the end.

IronPython:
 >>> class X(object):
...  p2 = property(lambda self: 34)
...
 >>> dir(X)
['<lambda$0>', '__class__', '__dict__', '__doc__', '__init__',
'__module__', '__
new__', '__reduce__', '__reduce_ex__', '__repr__', '__weakref__', 'p2']

See the weird first entry! Shouldn't be there...

Thanks

Michael



--
Michael Foord
Resolver Systems
michael.foord at resolversystems.com

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