我在导入xlrd python模块时遇到问题，该模块位于/usr/lib/pymodules/python2.7和/usr/local/lib/python2.7/dist-packages中。我想从/usr/local/lib/python2.7/dist-packages导入一个，但无论我做什么/usr/lib/pymodules/python2.7都停留在我的sys.path之上！
我没有成功修改我的PYTHOPATH。我的.basrc的最后一行是
export PYTHONPATH=/usr/local/lib/python2.7/dist-packages:$PYTHONPATH
所以我认为dist-packages必须位于sys.path之上！？
有人可以帮助我吗？
这是 ubunutu 12.04lts ， python2.7 ， iPython 0.12.1
当然，如果我手动编辑sys.path - 一切正常 - 我得到了正确版本的xlrd，但那个丑陋吧？我想知道将/usr/lib/pymodules...置于列表顶部的原因是什么？？
这是我的sys.path：
['', '/usr/bin', '/usr/lib/pymodules/python2.7', '/usr/local/lib/python2.7/dist-packages/distribute-0.7.3-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/setuptools-5.4.2-py2.7.egg', '/usr/local/lib/python2.7/dist-packages', '/home/venevs/Dropbox/usr/local/lib/my_packages', '/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/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/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', '/usr/lib/python2.7/dist-packages/IPython/extensions']