interactive mode doesn't display images with standard python interpreter #5561
Description
All the codes won't display images, and there is a warning when I try to exit from python shell, which I don't know if is relevant.
############################################################
# first try using pylab
############################################################
>>> from pylab import *
>>> matplotlib.interactive(True)
>>> matplotlib.is_interactive()
True
>>> plot([1,2,3])
[<matplotlib.lines.Line2D object at 0x7ff821558290>]
>>> # <--------------- press Ctrl-D here
/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_gtk3.py:219: Warning: Source ID 8 was not found when attempting to remove it
GLib.source_remove(self._idle_draw_id)
############################################################
# second try using ion()
############################################################
>>> import matplotlib.pyplot as plt
>>> plt.ion()
>>> plt.plot([1,2,3]) # No image displayed
[<matplotlib.lines.Line2D object at 0x7f940c91b790>]
>>> plt.show() # still no image displayed
>>> # <--------------- press Ctrl-D here
/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_gtk3.py:219: Warning: Source ID 8 was not found when attempting to remove it
GLib.source_remove(self._idle_draw_id)
############################################################
# third try using show() with interactive mode
############################################################
>>> import matplotlib.pyplot as plt
>>> plt.ion()
>>> plt.plot([1,2,3])
[<matplotlib.lines.Line2D object at 0x7efe545b2790>]
>>> plt.show() # no image displayed
>>> # <--------------- press Ctrl-D here
/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_gtk3.py:219: Warning: Source ID 8 was not found when attempting to remove it
GLib.source_remove(self._idle_draw_id)However if interactive mode is not used, everything is fine. After I close the image window and exit python shell later on, there is no warning.
>>> import matplotlib.pyplot as plt
p>>> plt.plot([1,2,3])
[<matplotlib.lines.Line2D object at 0x7f534d7da7d0>]
>>> plt.show() # image pops upBelow is my environment information:
$ uname -a
Linux localhost 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt17-1 (2015-09-26) x86_64 GNU/Linux
$ python
Python 2.7.9 (default, Mar 1 2015, 12:57:24)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
>>> matplotlib.__version__
'1.5.0'
>>> matplotlib.get_backend()
u'GTK3Agg'