引用numpy出错详解及解决方法

numpy出错 解决方案
Problem: how to import numpy in subdirectory? Import error of numpy within subfolder.
错误信息：
>>> import numpy
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/numpy/__init__.py", line 153, in
from . import add_newdocs
File "/usr/local/lib/python2.7/dist-packages/numpy/add_newdocs.py", line 13, in
from numpy.lib import add_newdoc
File "/usr/local/lib/python2.7/dist-packages/numpy/lib/__init__.py", line 18, in
from .polynomial import *
File "/usr/local/lib/python2.7/dist-packages/numpy/lib/polynomial.py", line 19, in
from numpy.linalg import eigvals, lstsq, inv
File "/usr/local/lib/python2.7/dist-packages/numpy/linalg/__init__.py", line 50, in
from .linalg import *
File "/usr/local/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 29, in
from numpy.linalg import lapack_lite, _umath_linalg
ImportError: libatlas.so.3gf: cannot open shared object file: No such file or directory

可能原因：
1. 子文件夹下有自己建的numpy.py文件
2. 看最后一行的错误，找不到libatlas.so.3gf. 将其所在文件夹引入/etc/ld.so.conf,缺啥补啥
$ sudo gedit /etc/ld.so.conf
写入/usr/lib/atlas-base
$ sudo ldconfig
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