导入matplotlib.pyplot报错，在线等待！

[oldbee0925]

python 3.7，anaconda 3.0 ,win10 64位，单独导入matplotlib没问题，但是导入matplotlib.pyplot 就报错。
In [17]: import matplotlib
In [18]: import matplotlib.pyplot as plt
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-18-a0d2faabd9e9> in <module>
----> 1 import matplotlib.pyplot as plt

E:\ProgramData\Anaconda3\lib\site-packages\matplotlib\pyplot.py in <module>
68 LinearLocator, LogLocator, AutoLocator, MultipleLocator,\
69 MaxNLocator
---> 70 from matplotlib.backends import pylab_setup, _get_running_interactive_framework
71
72 _log = logging.getLogger(__name__)

ImportError: cannot import name 'pylab_setup' from 'matplotlib.backends' (E:\ProgramData\Anaconda3\lib\site-packages\matplotlib\backends\__init__.py)