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Thank you very much for your answer!
I post the full solution to anyone else maybe need it:
try:
 conn = psycopg2.connect("dbname='...' user='...' host='127.0.0.1'
password='....'");
except:
 print "I am unable to connect to the database"
curs = conn.cursor()
........ code to create image/graph....... #canvas contains graph
import StringIO
data=StringIO.StringIO()
canvas.print_figure(data, dpi=150, format="png")
sql = "update table set image=%s;"
curs.execute(sql,(encoded_data,))
conn.commit()
2009年12月19日 Jae-Joon Lee <lee...@gm...>
> On Fri, Dec 18, 2009 at 3:06 AM, Panagiotis Kontaxis <pko...@gm...>
> wrote:
> > I found only the figure.savefig() function that saves figure's image only
> as
> > a filename in the filesystem and not in a local variable.
>
>
>
> http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.savefig
>
> savefig can take any file-like object, not just a file name.
>
> Check your matplotlib version, and upgrade if you can.
>
> Regards,
>
> -JJ
>

I just filed a bug related with this.
https://sourceforge.net/tracker/?func=detail&aid=2917758&group_id=80706&atid=560720
I think the possible solution could be
 1) we keep the copied version of the input data as a cache, and
provide a api to access the cache.
 2) Or forsce set_[x|y]data to always update.
My current inclination is the option 1.
If there is any other opinion, I'll go ahead and make a change in a few days.
-JJ
On Tue, Dec 15, 2009 at 9:12 AM, Antonino Ingargiola <tri...@gm...> wrote:
> Hi to all,
>
> I'm doing a simple animation like this:
>
> --
> ion()
> x = arange(0,2,0.01)
> y = zeros_like(x)
> y[45:55]=1
> l, = plot(x,y)
>
> D = 0.1
> h = x[1]-x[0]
> dt = 0.0001;
>
> def nabla(v,h):
>  na = zeros_like(v)
>  na[1:-1] = (v[2:]-2*v[1:-1]+v[:-2])
>  na[0],na[-1] = 0,0
>  return na/(h**2)
>
> for i in range(1000):
>  y = y + D*nabla(y,h)*dt
>  if i%10 == 0:
>    l.set_ydata(y)
>    draw()
> --
>
> however, changing the line
>
>  y = y + D*nabla(y,h)*dt with
>
> in
>
>  y += D*nabla(y,h)*dt
>
> the plot is not updated anymore. I have to replace l.set_ydata(y) with
> y.recache() to make the the animation work again.
>
> I think this is a bug since the line should be updated even using the
> += operator.
>
> Regards,
> Antonio
>
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I can reproduce this bug with the current svn.
Matthias, can you file a bug on this in the issue tracker?
I think the bug is related with the changes made back in august.
 http://old.nabble.com/ginput-default-mouse-configuration-td24924861.html
Attached is a quick fix, so please test it.
I didn't thoroughly follow the changes made related with the above
conversation, so I hope those involved (Jack Sankey, John and Gaël)
take a look and make a relevant changes if necessary.
Regards,
-JJ
On Tue, Dec 15, 2009 at 10:22 AM, Matthias Michler
<Mat...@gm...> wrote:
> Hello list,
>
> I run into trouble with the formelly working
> example ''ginput_manual_clabel.py'' or the following minimal example (in
> ipython -pylab)
>
> CS = plt.contour(reshape(arange(20)%3, (4, 5)), [0, 1, 2])
> CL = plt.clabel( CS, manual=True )
>
> First of all I get a DeprecationWarning during the startup (for GTKAGG and
> TKAGG)
>
> /scratch/michler/SOFT/lib/python2.5/site-packages/matplotlib/backend_bases.py:1793:
> DeprecationWarning: Using default event loop until function specific to this
> GUI is implemented
> warnings.warn(str,DeprecationWarning)
>
> and the worse point is that I am not able to select some clabel-positions
> (GTKAGG, TKAGG and WXAGG) and
> if I try to leave the selection mode I get
>
> GTKAGG:
> <type 'exceptions.TypeError'>: stop_event_loop() takes exactly 1 argument (2
> given)
> /scratch/michler/SOFT/lib/python2.5/site-packages/matplotlib/blocking_input.py(196)mouse_event_stop()
>  195     # returned before using data.
> --> 196     self.fig.canvas.stop_event_loop(event)
>  197
>
> TKAGG:
> File "/usr/lib/python2.5/lib-tk/Tkinter.py", line 920, in update
>  self.tk.call('update')
> _tkinter.TclError: can't invoke "update" command: application has been
> destroyed
>
> WXAGG:
> nothing
>
> Could anybody help me?
>
> Kind regards,
> Matthias
>
>
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>
>

On Fri, Dec 18, 2009 at 3:06 AM, Panagiotis Kontaxis <pko...@gm...> wrote:
> I found only the figure.savefig() function that saves figure's image only as
> a filename in the filesystem and not in a local variable.
http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.savefig
savefig can take any file-like object, not just a file name.
Check your matplotlib version, and upgrade if you can.
Regards,
-JJ