Re: [Matplotlib-users] IDLE hangs despite -n

[Hans F. <H.F...@so...>]

Hi John,

I am coming back to our earlier discussion ...

>>>>>>> "Hans" == Hans Fangohr <H.F...@so...> writes:
>> 
>>> Hm. Done that. A figure window pops up immediately but is
>>> not being updated correctly: a part of the graph is visible,
>>> the other part of the figure (which was underneath another
>>> window initially) appears white. The titel of the figure
>>> says "Figure 1 (Not responding)".  IDLE, however, responds
>>> happily ;-) T
>> 
>> Todd, many moons ago you wrote me and said I had inadvertently screwed
>> up something in tkagg show that broke the idle -n behavior.  If I
>> recall correctly, we never reverted, since I didn't understand exactly
>> what to do.  Perhaps you could revisit the current tkagg versus the
>> old one to make sure it is right.
>> 
>> Hans, does it make a difference if you uncomment
>> 
>> #os.environ['PYTHONINSPECT'] = '1'
>> 
>> in the show method of
>> site-packages/matplotlib/backends/backend_tkagg.py? You should set
>> 'interactive : True' as Todd suggested.  Do not use show, as it is not
>> designed for interactive use.  I suggest carefully testing all 4
>> combinations: with and without the PYTHONINSPECTmline, and with and
>> without -n.
>
> Setting 'interactive=True' in .matplotlibrc
>
> IDLE           #os.environ['PYTHONINSPECT'] = '1'        -> fail
> IDLE -n        #os.environ['PYTHONINSPECT'] = '1'        -> fail
> IDLE           os.environ['PYTHONINSPECT'] = '1'         -> fail
> IDLE -n        os.environ['PYTHONINSPECT'] = '1'         -> success
>
> So that's good.

This doesn't work in non-interactive mode. What I observe is this:

- start Idle with -n (the "==== No Subprocess ====" message appears).
- at prompt issue commands:
>>>import pylab
>>>pylab.plot(range(10))
>>>pylab.show()
- figure windows shows up
- python reports this error message:

>>> pylab.show()
Exception in Tkinter callback
Traceback (most recent call last):
   File "C:\Python23\lib\lib-tk\Tkinter.py", line 1345, in __call__
     return self.func(*args)
   File 
"C:\Python23\lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 215, in key_release
     FigureCanvasBase.key_release_event(self, key)
   File "C:\Python23\Lib\site-packages\matplotlib\backend_bases.py",
line 677, in key_release_event
     event = KeyEvent('key_release_event', self, key, self._lastx, 
self._lasty)
   File "C:\Python23\Lib\site-packages\matplotlib\backend_bases.py",
line 640, in __init__
     LocationEvent.__init__(self, name, canvas, x, y)
   File "C:\Python23\Lib\site-packages\matplotlib\backend_bases.py",
line 566, in __init__
     if a.in_axes(self.x, self.y):
   File "C:\Python23\Lib\site-packages\matplotlib\axes.py", line 1544, in 
in_axes
     return self.bbox.contains(xwin, ywin)
TypeError: float() argument must be a string or a number


The figure windows is interacting (despite the error message). Once I 
close the figure window, I can't get back to the Python prompt; i.e. the 
shell doesn't respond any more.

Do we expect matplotlib (0.70.1) to work in non-interactive mode with 
"IDLE -n"?

Thanks,

Hans