Re: [Matplotlib-users] Grouper use

[Michael D. <md...@st...>]

Yes -- I'll update the docstring.  The weakref support was added 
afterward during one of my many memory leak crusades ;)

What were you attempting to do with the Grouper?  You shouldn't have to 
use the class directly to use the sharex/sharey functionality -- it's 
only an implementation detail.

Mike

Eric Firing wrote:
> TP wrote:
>   
>> Hi everybody,
>>
>> I try to play with "sharex" feature. Then, I have been guided to the
>> class "Grouper" of module cbook:
>>
>> http://matplotlib.sourceforge.net/api/cbook_api.html
>>
>> So I tried the following example:
>>
>> ##############################
>> from matplotlib.cbook import *
>>
>> g = Grouper()
>> g.join('a', 'b')
>> ##############################
>>
>> I obtain:
>>
>> Traceback (most recent call last):
>>   File "test_grouper.py", line 4, in <module>
>>     g.join('a', 'b')
>>   File ".../matplotlib/cbook.py", line 1118, in join
>>     set_a = mapping.setdefault(ref(a), [ref(a)])
>> TypeError: cannot create weak reference to 'str' object
>>
>> What is the problem?
>>     
>
> Grouper is implemented using weak references, which are supported only 
> for some types of objects, as described here:
> http://docs.python.org/library/weakref.html
>
> Evidently the cbook Grouper docstring was written when the 
> implementation was different, and did not use weakref.  So, you have 
> found a major bug in the docstring.
>
> Eric
>
>   
>> Thanks in advance,
>>
>> Julien
>>
>>     
>
>
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA