ImportError：无法在ubuntu上导入名称cbook

Question

当我编译代码时，我得到了

Traceback (most recent call last):
  File "knn.py", line 12, in <module>
    import seaborn as sns
  File "/home/benmoufida/.local/lib/python2.7/site-packages/seaborn/__init__.py", line 2, in <module>
    import matplotlib as mpl
  File "/home/benmoufida/.local/lib/python2.7/site-packages/matplotlib/__init__.py", line 126, in <module>
    from . import cbook
ImportError: cannot import name cbook