(playground)  nathan@x86_64-apple-darwin13  ~ ipython
Python 3.6.7 |Anaconda, Inc.| (default, Oct 23 2018, 14:01:38)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.2.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import matplotlib

In [2]: matplotlib.__version__
Out[2]: '3.0.2'

In [3]: import matplotlib.pyplot as plt
   ...:
   ...: data = {'cats': 10, 'dogs': 20}
   ...:
   ...: # Works as expected
   ...: fig, ax = plt.subplots(1)
   ...: ax.bar(range(len(data)), data.values())
   ...:
   ...: # Doesn't work
   ...: fig, ax = plt.subplots(1)
   ...: ax.barh(range(len(data)), data.values())
   ...:
   ...: # Works as expected
   ...: fig, ax = plt.subplots(1)
   ...: ax.barh(range(len(data)), list(data.values()))
   ...:
   ...: plt.show()
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-79a8e56f0f43> in <module>
      9 # Doesn't work
     10 fig, ax = plt.subplots(1)
---> 11 ax.barh(range(len(data)), data.values())
     12
     13 # Works as expected

~/anaconda3/envs/playground/lib/python3.6/site-packages/matplotlib/axes/_axes.py in barh(self, y, width, height, left, align, **kwargs)
   2461         kwargs.setdefault('orientation', 'horizontal')
   2462         patches = self.bar(x=left, height=height, width=width, bottom=y,
-> 2463                            align=align, **kwargs)
   2464         return patches
   2465

~/anaconda3/envs/playground/lib/python3.6/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)
   1808                         "the Matplotlib list!)" % (label_namer, func.__name__),
   1809                         RuntimeWarning, stacklevel=2)
-> 1810             return func(ax, *args, **kwargs)
   1811
   1812         inner.__doc__ = _add_data_doc(inner.__doc__,

~/anaconda3/envs/playground/lib/python3.6/site-packages/matplotlib/axes/_axes.py in bar(self, x, height, width, bottom, align, **kwargs)
   2294                 edgecolor=e,
   2295                 linewidth=lw,
-> 2296                 label='_nolegend_',
   2297                 )
   2298             r.update(kwargs)

~/anaconda3/envs/playground/lib/python3.6/site-packages/matplotlib/patches.py in __init__(self, xy, width, height, angle, **kwargs)
    664         self._height = height
    665
--> 666         self._x1 = self._x0 + self._width
    667         self._y1 = self._y0 + self._height
    668

TypeError: unsupported operand type(s) for +: 'int' and 'dict_values'

In [4]: