In [1]: import numpy as np

In [2]: import matplotlib.pyplot as plt

In [3]: x = np.arange(10)

In [4]: y = np.random.poisson(100, 10)

In [5]: plt.errorbar(x, y, drawstyle="steps-mid")
Out[5]: <ErrorbarContainer object of 3 artists>

In [6]: plt.show()  # It works

In [7]: yerr = np.zeros_like(y) + 10

In [8]: plt.errorbar(x, y, yerr=yerr, drawstyle="steps-mid")
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-8-a70dfad4683c> in <module>
----> 1 plt.errorbar(x, y, yerr=yerr, drawstyle="steps-mid")

~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/pyplot.py in errorbar(x, y, yerr, xerr, fmt, ecolor, elinewidth, capsize, barsabove, lolims, uplims, xlolims, xuplims, errorevery, capthick, data, **kwargs)
   2739         uplims=False, xlolims=False, xuplims=False, errorevery=1,
   2740         capthick=None, *, data=None, **kwargs):
-> 2741     return gca().errorbar(
   2742         x, y, yerr=yerr, xerr=xerr, fmt=fmt, ecolor=ecolor,
   2743         elinewidth=elinewidth, capsize=capsize, barsabove=barsabove,

~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)
   1350     def inner(ax, *args, data=None, **kwargs):
   1351         if data is None:
-> 1352             return func(ax, *map(sanitize_sequence, args), **kwargs)
   1353 
   1354         bound = new_sig.bind(ax, *args, **kwargs)

~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/axes/_axes.py in errorbar(self, x, y, yerr, xerr, fmt, ecolor, elinewidth, capsize, barsabove, lolims, uplims, xlolims, xuplims, errorevery, capthick, **kwargs)
   3496         if yerr is not None:
   3497             lower, upper = extract_err('y', yerr, y, lolims, uplims)
-> 3498             barcols.append(self.vlines(
   3499                 *apply_mask([x, lower, upper], everymask), **eb_lines_style))
   3500             # select points without upper/lower limits in y and

~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)
   1350     def inner(ax, *args, data=None, **kwargs):
   1351         if data is None:
-> 1352             return func(ax, *map(sanitize_sequence, args), **kwargs)
   1353 
   1354         bound = new_sig.bind(ax, *args, **kwargs)

~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/axes/_axes.py in vlines(self, x, ymin, ymax, colors, linestyles, label, **kwargs)
   1118                                      linestyles=linestyles, label=label)
   1119         self.add_collection(lines, autolim=False)
-> 1120         lines.update(kwargs)
   1121 
   1122         if len(x) > 0:

~/anaconda3/envs/py38/lib/python3.8/site-packages/matplotlib/artist.py in update(self, props)
   1060                     func = getattr(self, f"set_{k}", None)
   1061                     if not callable(func):
-> 1062                         raise AttributeError(f"{type(self).__name__!r} object "
   1063                                              f"has no property {k!r}")
   1064                     ret.append(func(v))

AttributeError: 'LineCollection' object has no property 'drawstyle'