[IronPython] very strange dictionnary bug

Dino Viehland dinov at exchange.microsoft.com
Fri Aug 18 08:13:08 PDT 2006


I haven't seen anything like this before... But I have a couple of questions:  Are the keys always strings when it repros?  And is the dictionary always created using the {} syntax?

I ask because we have a lot of different dictionary implementations, or there could be a bug where we have different instances of some basic object that are hashing differently for some reason (although given the code below, that seems strange).

-----Original Message-----
From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Stanislas Pinte
Sent: Friday, August 18, 2006 7:38 AM
To: Discussion of IronPython
Subject: Re: [IronPython] very strange dictionnary bug

By the way, the environment in which the bug shows up is single-threaded, so I do not suspect any concurrent access problem.

Stan.

Stanislas Pinte a écrit :
> Hello,
>
> We are just seeing a very strange bug in the following code:
>
> myDictionnary = {}
> .
> for key in myDictionnary.keys():
>   assert myDictionnary.has_key(key) --> throw AssertionError
>
> this is fixed by the following change:
>
> for key, value in myDictionnary.iteritems():
>   ...
>
> Ever seen this?
>
> Too bad I cannot reproduce this...a very simple test case like the one
> below doesn't do the trick...
>
> thanks,
>
> Stan.
>
> [sim-ironpython]> ironpython/ipy.exe
> IronPython 1.0.60816 on .NET 2.0.50727.42 Copyright (c) Microsoft
> Corporation. All rights reserved.
>>>> a = {"one": 1, "two": 2, "three": 3} a["one"]
> 1
>>>> a.pop("one")
> 1
>>>> a
> {'two': 2, 'three': 3}
>>>> a.keys()
> ['two', 'three']
>>>> for k in a.keys():
> .     print k
> .
> two
> three
>


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