ValueError: need more than 1 value to unpack

[Edwin Hu]

I'm seeing this error:

In [2]: import matplotlib.pyplot as plt
   ...: plt.plot([1,2,3,4])
   ...: plt.ylabel('some numbers')
   ...: plt.show()
   ...:
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-2-a1c4f0c7307c> in <module>()
      2 plt.plot([1,2,3,4])
      3 plt.ylabel('some numbers')
----> 4 plt.show()

/home/hue/anaconda2/lib/python2.7/site-packages/matplotlib/pyplot.pyc in show(*args, **kw)
    242     """
    243     global _show
--> 244     return _show(*args, **kw)
    245
    246

/home/hue/bin/itermplot/itermplot.pyc in show()
     93     figmanager = Gcf.get_active()
     94     if figmanager is not None:
---> 95         figmanager.show()
     96     else:
     97         for manager in Gcf.get_all_fig_managers():

/home/hue/bin/itermplot/itermplot.pyc in show(self)
    205         data = io.BytesIO()
    206         self.canvas.print_figure(data, facecolor='none',
--> 207                                  edgecolor='none', transparent=True)
    208         imgcat(data.getbuffer())
    209

/home/hue/anaconda2/lib/python2.7/site-packages/matplotlib/backend_bases.pyc in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, **kwargs)
   2230                 orientation=orientation,
   2231                 bbox_inches_restore=_bbox_inches_restore,
-> 2232                 **kwargs)
   2233         finally:
   2234             if bbox_inches and restore_bbox:

/home/hue/bin/itermplot/itermplot.pyc in print_pdf(self, filename, **kwargs)
    172
    173         if 'rv' in os.getenv('ITERMPLOT'):
--> 174             self.reverse()
    175
    176         image_dpi = kwargs.get('dpi', 72)  # dpi to use for images

/home/hue/bin/itermplot/itermplot.pyc in reverse(self, **kwargs)
    147         for obj in self.figure.findobj():
    148             if not obj in seen:
--> 149                 modify(obj)
    150             seen.add(obj)
    151

/home/hue/bin/itermplot/itermplot.pyc in modify(c)
    140                 if not fcset:
    141                     c = obj.get_color()
--> 142                     obj.set_color(revvideo(c))
    143             except AttributeError as e:
    144                 pass

/home/hue/bin/itermplot/itermplot.pyc in revvideo(x)
     57         return np.array([rev(el) for el in x])
     58     else:
---> 59         return rev(x)
     60
     61 def imgcat(data, lines=-1):

/home/hue/bin/itermplot/itermplot.pyc in rev(c)
     48             return (1.0 - r, 1.0 - g, 1.0 - b, a)
     49         else:
---> 50             r, g, b = c
     51             return (1.0 - r, 1.0 - g, 1.0 - b, 1.0)
     52

ValueError: need more than 1 value to unpack

[Carlos Oliver]

hi! i'm getting the same issue.

[Tiffany R. Williams]

Thanks for sharing this project @daleroberts !

I'm also getting the same error above when I run @edwinhu's example code in ptpython.

I have the following error when I run in bpython:

Traceback (most recent call last):
File "", line 1, in
plt.show()
File "/Users/tw/miniconda3/lib/python3.5/site-packages/matplotlib/pyplot.py", line 252, in show
return _show(*args, **kw)
File "/Users/tw/itermplot/itermplot.py", line 95, in show
figmanager.show()
File "/Users/tw/itermplot/itermplot.py", line 208, in show
imgcat(data.getbuffer())
File "/Users/tw/itermplot/itermplot.py", line 82, in imgcat
sys.stdout.buffer.write(buf)
AttributeError: 'FakeOutput' object has no attribute 'buffer'

and the code actually works when I run in the basic python terminal, though it'd be great if it worked with other python interpreters as the basic one is pretty limiting. Thanks!

[Dale Roberts]

@edwinhu I've fixed the unpack bug by catching the exception and keeping the color "as is" if it can't parse it. Even though I couldn't reproduce the bug in matplotlib 1.5.3 with the code:

import matplotlib.pyplot as plt
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
plt.show()

@Tiffany8 I'm going to look at the strange bpython bug now...

Thanks for pointing out these bugs :)