The error in python :ImportError: No module named xxx

        只要出现ImportError 错误就说明有一个包缺失。在本例中，我们安装的networkx 模块有一个未作处理的依赖项——numpy ，它是一个高度优化的科学计算工具集。通常，再次调用easy_install 就可以解决这个问题，处理numpy 缺失的方法与安装NetworkX 的方法一样。只要关闭解释器，并且在终端输入easy_install numpy 即可安装该依赖项.
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>>> import networkx as nx
Traceback (most recent  call last):
  File "", line 1, in <module>
ImportError: No module named networkx
>>> exit()
warrior@warrior:~$ sudo easy_install networkx
Searching for networkx
.......
Installed /usr/local/lib/python2.7/dist-packages/decorator-4.0.2-py2.7.egg
Finished processing dependencies for networkx

the more detail:
http://my.oschina.net/leejun2005/blog/109679
http://book.2cto.com/201301/13763.html