在ubuntu下安装了python2.7和python3.4，安装numpy后在执行Python程序时仍出现No module named 'numpy'，因两个版本的python都需要匹配numpy。
首先python2.7：sudo apt-get install python-numpy
其次python3.4：sudo apt-get install python3-numpy
然后分别进入各版本的shell 测试import numpy是否成功。
hadoop@ub1401:~/python/pythonfile$ python
Python 2.7.6
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> import numpy as np
>>> exit()
----------------------------------------------------
hadoop@ub1401:~/python/pythonfile$ python3
Python 3.4.3
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> exit()