[IPython-dev] ipipe news

Walter Dörwald walter at livinglogic.de
Wed Mar 8 13:37:51 EST 2006

Torsten Marek wrote:

> Fernando Perez schrieb:
>> Walter Dörwald wrote:
>>> [...]
>>> 3) Pass a dictionary that contains all the attributes from the list. 
>>> This has the disadvantage that (for iwalk etc.) there will be many 
>>> os.stat() calls, even if the result is never used (and you can't 
>>> reference attributes that are not in the field list).
>>> BTW, the reason why you got an empty browser was, because ifilter 
>>> ignores all objects where evaluating the expression raises and 
>>> Exception. And then the expression for isort never fails, because 
>>> there's nothing left to sort.
>>> Anyway, IMHO we should implement 2) and document the possibility to 
>>> directly reference attributes as a "2.4 goodie".
>> That sounds like  a good plan.  2.3 compatibility is important because a large 
>> number of installed users still have that (Mac OSX and the 'enterprise' 
>> versions of RedHat, amongst others) in their 'out of the box' configs.  But 
>> it's OK if a few extra conveniences are only available for 2.4 when they they 
>> can't be implemented in a backport, as long as the basic functionality (like 
>> the example in the docstring :)  work with 2.3.
> Hi,
> here's a patch for ipipe that works around the shortcomings of Python 2.3. I
> don't know whether is satisfies the constraint in 3,

It does. Only the attributes mentioned in the expression are copied. But 
of course evil expressions like ifilter("locals()['value'] is not None") 
won't work, because the attribute is only referenced indirectly.

Nevertheless it's still better than only supporting "_".

> but it works for the
> examples mentioned here on the list.

The patch looks good to me (But the comments and docstrings should be 
updated of course).


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