---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-9-264dcc0313f6> in <module>
      6                                                             linewidth=2.0, linestyle='--',
      7                                                             alpha=0.2,
----> 8                                                             label='span')
      9 axes.add_collection(collection)

/opt/anaconda3/envs/eda/lib/python3.7/site-packages/matplotlib/collections.py in span_where(x, ymin, ymax, where, **kwargs)
   1131 
   1132         collection = BrokenBarHCollection(
-> 1133             xranges, [ymin, ymax - ymin], **kwargs)
   1134         return collection
   1135 

/opt/anaconda3/envs/eda/lib/python3.7/site-packages/matplotlib/collections.py in __init__(self, xranges, yrange, **kwargs)
   1111                   (xmin + xwidth, ymin),
   1112                   (xmin, ymin)] for xmin, xwidth in xranges]
-> 1113         PolyCollection.__init__(self, verts, **kwargs)
   1114 
   1115     @staticmethod

/opt/anaconda3/envs/eda/lib/python3.7/site-packages/matplotlib/collections.py in __init__(self, verts, sizes, closed, **kwargs)
   1044         Collection.__init__(self, **kwargs)
   1045         self.set_sizes(sizes)
-> 1046         self.set_verts(verts, closed)
   1047         self.stale = True
   1048 

/opt/anaconda3/envs/eda/lib/python3.7/site-packages/matplotlib/collections.py in set_verts(self, verts, closed)
   1065                     codes[0] = mpath.Path.MOVETO
   1066                     codes[-1] = mpath.Path.CLOSEPOLY
-> 1067                     self._paths.append(mpath.Path(xy, codes))
   1068                 else:
   1069                     self._paths.append(mpath.Path(xy))

/opt/anaconda3/envs/eda/lib/python3.7/site-packages/matplotlib/path.py in __init__(self, vertices, codes, _interpolation_steps, closed, readonly)
    125             and codes as read-only arrays.
    126         """
--> 127         vertices = _to_unmasked_float_array(vertices)
    128         if vertices.ndim != 2 or vertices.shape[1] != 2:
    129             raise ValueError(

/opt/anaconda3/envs/eda/lib/python3.7/site-packages/matplotlib/cbook/__init__.py in _to_unmasked_float_array(x)
   1388         return np.ma.asarray(x, float).filled(np.nan)
   1389     else:
-> 1390         return np.asarray(x, float)
   1391 
   1392 

/opt/anaconda3/envs/eda/lib/python3.7/site-packages/numpy/core/_asarray.py in asarray(a, dtype, order)
     83 
     84     """
---> 85     return array(a, dtype, copy=False, order=order)
     86 
     87 

TypeError: float() argument must be a string or a number, not 'Timestamp'