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Asked: 2026-06-15T09:20:09+00:00

Firstly, I know very very little about Python, Xwindows, Matplotlib or GTK. I am

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Firstly, I know very very little about Python, Xwindows, Matplotlib or GTK. I am trying to run a tool called SpliceGrapher which uses the above. I get an (ugly, sorry) error:

 /usr/lib64/python2.6/site-packages/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display
 warnings.warn(str(e), _gtk.Warning)
 /home/my/bin/lib64/python2.6/site-packages/matplotlib/backends/backend_gtk.py:52: GtkWarning: gdk_cursor_new_for_display: assertion `GDK_IS_DISPLAY (display)' failed
 cursors.MOVE          : gdk.Cursor(gdk.FLEUR),
 Traceback (most recent call last):
 File "/home/my/bin/SpliceGrapher-0.2.0/scripts/view_splicegraphs.py", line 28, in <module>
    from pylab      import *
  File "/home/my/bin/lib64/python2.6/site-packages/pylab.py", line 1, in <module>
from matplotlib.pylab import *
  File "/home/my/bin/lib64/python2.6/site-packages/matplotlib/pylab.py", line 264, in <module>
from matplotlib.pyplot import *
  File "/home/my/bin/lib64/python2.6/site-packages/matplotlib/pyplot.py", line 95, in <module>
new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "/home/my/bin/lib64/python2.6/site-packages/matplotlib/backends/__init__.py", line 25, in pylab_setup
globals(),locals(),[backend_name])
  File "/home/my/bin/lib64/python2.6/site-packages/matplotlib/backends/backend_gtkagg.py", line 10, in <module>
from matplotlib.backends.backend_gtk import gtk, FigureManagerGTK, FigureCanvasGTK,\
  File "/home/my/bin/lib64/python2.6/site-packages/matplotlib/backends/backend_gtk.py", line 52, in <module>
    cursors.MOVE          : gdk.Cursor(gdk.FLEUR),
  RuntimeError: could not create GdkCursor object

If anyone has any idea what I can do, that would be great.

I am on a Linux (RedHat) system, through puTTy using Xming. I have X11 configured and xeyes shows the little eyes that follow my mouse so I know thats working.

New error:

16:00:46 view_splicegraphs.py Started
Traceback (most recent call last):
File "/home/bmoran/bin/SpliceGrapher-0.2.0/scripts/view_splicegraphs.py", line 164, in <module>
g = getFirstGraph(f)
File "/home/bmoran/bin/lib64/python2.6/site-packages/SpliceGrapher/SpliceGraph.py", line 371, in getFirstGraph
result = SpliceGraphParser(f, **args).next()
File "/home/bmoran/bin/lib64/python2.6/site-packages/SpliceGrapher/SpliceGraph.py", line 1351, in __init__
self.loadFromFile()
File "/home/bmoran/bin/lib64/python2.6/site-packages/SpliceGrapher/SpliceGraph.py", line 1424, in loadFromFile
raise ValueError("Graph feature found before graph header at line %d" % lineNo)
ValueError: Graph feature found before graph header at line 1
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1 Answer

  1. Editorial Team
     /usr/lib64/python2.6/site-packages/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display

    Tells you your script does not have an access to your X session.

    Can you post here your script?

    Did you access the machine with ssh -XC ... ?

    on the shell when you issue echo $DISPLAY what do you see?
    When you add in your script print os.getenv("DISPLAY") do you see the same result?

    one more note … I don’t know Xming but I can recommend you to try MobaXterm, it has a builtin ssh and X11 server compiled for Windows, and my guess is that it will solve your X problem.

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