这真让我抓狂。我试图删除安装在python上mac os x el capitan并重新安装brew install python和的所有python软件包pip。我在这里：

which pip
/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/bin/pip

和

which python
/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/bin/python

所以用 pip list

pip list
cycler (0.10.0)
matplotlib (1.5.1)
numpy (1.11.0)
pip (8.1.2)
python-dateutil (2.5.3)
pytz (2016.4)
setuptools (19.4)
six (1.10.0)
wheel (0.26.0)

但是，当我运行python时，没有名为numpy和matplotlib的模块：

python
Python 2.7.11 (default, Jan 22 2016, 08:29:18) 
[GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named numpy
>>> import matplotlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/matplotlib/__init__.py", line 122, in <module>
    from matplotlib.cbook import is_string_like, mplDeprecation, dedent, get_label
  File "/usr/local/lib/python2.7/site-packages/matplotlib/cbook.py", line 33, in <module>
    import numpy as np
ImportError: No module named numpy

这是我的sys.path：

sys.path
['', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/site-packages/gtk-2.0']