Python 3.5.4 |Continuum Analytics, Inc.| (default, Aug 14 2017, 13:26:58)Type 'copyright', 'credits' or 'license' for more informationIPython 6.1.0 -- An enhanced Interactive Python. Type '?' for help.In [1]: import matplotlibIn [2]: matplotlib.__version__Out[2]: '2.0.2'In [3]: matplotlib.rcParams['lines.linestyle'] = 'steps-post'In [4]: print(matplotlib.get_backend())Qt5Agg

Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 17:14:51)Type 'copyright', 'credits' or 'license' for more informationIPython 7.0.1 -- An enhanced Interactive Python. Type '?' for help.In [1]: import matplotlibIn [2]: matplotlib.__version__Out[2]: '3.0.0'In [3]: matplotlib.rcParams['lines.linestyle'] = 'steps-post'---------------------------------------------------------------------------ValueError                                Traceback (most recent call last)~/.conda/envs/bamboo/lib/python3.6/site-packages/matplotlib/__init__.py in __setitem__(self, key, val)    860             try:--> 861                 cval = self.validate[key](val)    862             except ValueError as ve:~/.conda/envs/bamboo/lib/python3.6/site-packages/matplotlib/rcsetup.py in _validate_linestyle(ls)    949     if isinstance(ls, (str, bytes, bytearray)):--> 950         return _validate_named_linestyle(ls)    951~/.conda/envs/bamboo/lib/python3.6/site-packages/matplotlib/rcsetup.py in __call__(self, s)     64         raise ValueError('Unrecognized %s string %r: valid strings are %s'---> 65                          % (self.key, s, list(self.valid.values())))     66ValueError: Unrecognized linestyle string 'steps-post': valid strings are ['-', '--', '-.', ':', 'solid', 'dashed', 'dashdot', 'dotted', 'none', ' ', '']During handling of the above exception, another exception occurred:ValueError                                Traceback (most recent call last)<ipython-input-3-7f838b7219da> in <module>----> 1 matplotlib.rcParams['lines.linestyle'] = 'steps-post'~/.conda/envs/bamboo/lib/python3.6/site-packages/matplotlib/__init__.py in __setitem__(self, key, val)    861                 cval = self.validate[key](val)    862             except ValueError as ve:--> 863                 raise ValueError("Key %s: %s" % (key, str(ve)))    864             dict.__setitem__(self, key, cval)    865         except KeyError:ValueError: Key lines.linestyle: Unrecognized linestyle string 'steps-post': valid strings are ['-', '--', '-.', ':', 'solid', 'dashed', 'dashdot', 'dotted', 'none', ' ', '']In [4]: print(matplotlib.get_backend())Qt5Agg