matplotlib-users Mailing List for matplotlib

Returning after a time to my animation project.
The first thing i did was to make sure anim_tk.py still runs. It 
didn't. A ghost figure window appears, and there is a long stall, then 
the message:
elapsed 10.7956385487
Fatal Python error: PyEval_RestoreThread: NULL tstate
This application has requested the Runtime to terminate it in an unusual 
way.
Please contact the application's support team for more information.
Is it me, or did something break?
WinXP, matplotlib 0.64, recently installed by deleting the existing 
matplolib directory and installing using the windows installer. 
Examples installed from the latest zip.
thanks,
gary

On Tue, 2004年11月16日 at 17:45 +1100, matthew arnison wrote:
> Oh dear. I'm going to take another u-turn, and say I hit this
> IMAGE_FORMAT attribute glitch again.
> 
> To atone for my reversals, I have isolated a test case, and I attach
> sample code. It seems to be triggered by importing matplotlib.matlab in
> one module, and importing matplotlib backend stuff directly in another
> module.
> 
> Running frog.py gives:
> 
> Traceback (most recent call last):
...
> "C:\Python23\lib\site-packages\matplotlib\backends\backend_gtk.py", line
> 1423, in __init__
> self.IMAGE_FORMAT =
> matplotlib.backends.backend_mod.IMAGE_FORMAT
> AttributeError: 'module' object has no attribute 'IMAGE_FORMAT'
Its now fixed in CVS. backend_gtk now knows about all image formats and
does not need to look at other backends to see what formats they
support.
Steve

jk...@ik... wrote:
> Arguably Matlab has the elegant Lisp-like feature lacking in Python of
> multiple return values. In Lisp you can write
> 
> (setq x (floor 3.14))
> 
> to set the value of x to 3, or
> 
> (multiple-value-setq (x y) (floor 3.14))
> 
> to set the value of x to 3 and the value of y to 0.14. Note how it is
> left up to the caller of the FLOOR function whether to capture just
> the first returned value or both of them. This is paralleled by
> Matlab's
> 
> x = some_function(a,b,c)
> [x,y] = some_function(a,b,c)
> 
> where the caller decides how many values will be returned.
Note that you can simply "emulate" this missing Python feature by 
appending indexes after your function call:
	x = some_function(a,b,c)[0]
	x, y = some_function(a,b,c)[:2]
	and so on...
Naturally this does not save computation as nargout could do, but is 
this really an issue? IMHO this is generally not.
JM. Philippe

Hello!
The problem was a problem with pygtk 2.4.0 and was caused by a parameter 
name "typename" which for C++ is also a keyword. Any C++ application 
using pygtk was affected and agg (which matplotlib is using) is written 
in C++. The fix to this problem was (among other few changes) to rename 
"typename" to "_typename", which was done in CVS shortly after pygtk 
2.4.0 was released.
In conclusion, just download pygtk 2.4.1 from pygtk.org and it will work!
Niklas Volbers.
Rich Drewes wrote:
> Hello,
> 
> Several users (including Humufr and Niklas Volbers) have reported on this
> list a compile error building matplotlib with pygtk. The error looks
> something like this:
> 
> In file included from src/_gtkagg.cpp:8:
> /usr/include/pygtk-2.0/pygobject.h:124: error: parse error before 
> `typename"
> /usr/include/pygtk-2.0/pygobject.h:131: error: parse error before 
> `typename"
> 
> I also experienced this problem. It appears to be some sort of namespace
> collision on the token "typename" (what this is colliding with isn't
> clear). By changing "typename" to "typname" or some other spelling in
> /usr/include/pygtk-2.0/pygobject.h I was then able to build matplotlib
> successfully.
> 
> If someone knows what is causing this and has a better solution, please
> advise. Perhaps it has something to do with GCC 3.4.x and that particular
> pygtk release.
> 
> Rich Drewes
> 
> 
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