numpy.core.multiarray无法导入

我使用以下命令来了解我正在使用的numpy版本

pip show numpy

输出如下所示

---
Name: numpy
Version: 1.8.2
Location: /usr/lib/python2.7/dist-packages
Requires: 

但是,当我运行matplotlib时,我收到了一个错误

RuntimeError: module compiled against API version a but this version of numpy is 9
        from matplotlib import pyplot as plt
      File "/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py", line 27, in 
        import matplotlib.colorbar
      File "/usr/local/lib/python2.7/dist-packages/matplotlib/colorbar.py", line 32, in 
        import matplotlib.artist as martist
      File "/usr/local/lib/python2.7/dist-packages/matplotlib/artist.py", line 12, in 
        from .transforms import Bbox, IdentityTransform, TransformedBbox, \
      File "/usr/local/lib/python2.7/dist-packages/matplotlib/transforms.py", line 39, in 
        from matplotlib._path import (affine_transform, count_bboxes_overlapping_bbox,

我试着升级numpy,

pip install numpy --upgrade

它显示安装成功,但numpy仍然显示为1.8.2并且在运行matplotlib时仍然存在错误.

我想卸载numpy并重新安装它,系统给出了消息说

Not uninstalling numpy at /usr/lib/python2.7/dist-packages, owned by OS

RuntimeError: module compiled against API version 9 but this version of numpy is 6
Traceback (most recent call last):
  File "", line 1, in 
ImportError: numpy.core.multiarray failed to import 

import numpy
print numpy.__path__

RuntimeError: module compiled against API version 9 but this version of numpy is 6
Traceback (most recent call last):
  File "", line 1, in 
ImportError: numpy.core.multiarray failed to import 

import numpy
print numpy.__path__