linux python 修改环境变量 添加自定义模块路径
举一个很简单的例子，如果你发现一个包或者模块，明明是有的，但是会发生这样的错误：
>>> from algorithm import *
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named algorithm
那么就应该是环境变量出问题了
okay，来看怎么搞
>>>>> import sys
>>> sys.path
[\'\', \'/usr/lib/python2.7\', \'/usr/lib/python2.7/plat-linux2\', \'/usr/lib/python2.7/lib-tk\', \'/usr/lib/python2.7/lib-old\', \'/usr/lib/python2.7/lib-dynload\', \'/usr/local/lib/python2.7/dist-packages\', \'/usr/lib/python2.7/dist-packages\', \'/usr/lib/python2.7/dist-packages/PIL\', \'/usr/lib/python2.7/dist-packages/gst-0.10\', \'/usr/lib/python2.7/dist-packages/gtk-2.0\', \'/usr/lib/pymodules/python2.7\', \'/usr/lib/python2.7/dist-packages/ubuntu-sso-client\', \'/usr/lib/python2.7/dist-packages/ubuntuone-client\', \'/usr/lib/python2.7/dist-packages/ubuntuone-control-panel\', \'/usr/lib/python2.7/dist-packages/ubuntuone-couch\', \'/usr/lib/python2.7/dist-packages/ubuntuone-installer\', \'/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol\']
首先，这些显示出了python自己的环境变量
然后
>>> sys.path.append(\'/media/File/Code_DownloadCodeAndSelfCode/PyWorkPlace/xView\')
>>> sys.path
[\'\', \'/usr/lib/python2.7\', \'/usr/lib/python2.7/plat-linux2\', \'/usr/lib/python2.7/lib-tk\', \'/usr/lib/python2.7/lib-old\', \'/usr/lib/python2.7/lib-dynload\', \'/usr/local/lib/python2.7/dist-packages\', \'/usr/lib/python2.7/dist-packages\', \'/usr/lib/python2.7/dist-packages/PIL\', \'/usr/lib/python2.7/dist-packages/gst-0.10\', \'/usr/lib/python2.7/dist-packages/gtk-2.0\', \'/usr/lib/pymodules/python2.7\', \'/usr/lib/python2.7/dist-packages/ubuntu-sso-client\', \'/usr/lib/python2.7/dist-packages/ubuntuone-client\', \'/usr/lib/python2.7/dist-packages/ubuntuone-control-panel\', \'/usr/lib/python2.7/dist-packages/ubuntuone-couch\', \'/usr/lib/python2.7/dist-packages/ubuntuone-installer\', \'/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol\', \'/media/File/Code_DownloadCodeAndSelfCode/PyWorkPlace/xView/emotionAnalyse\', \'/media/File/Code_DownloadCodeAndSelfCode/PyWorkPlace/xView\']
>>> import algorithm
这样，就把自己的algorithm这个包导入了
ok了！
可是这样有个问题，下次还得设置才行。
那么就改一下系统变量吧:
$export PYTHONPATH=$PYTHONPATH:/home/YOURSELFPATH
亲测有效～