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The variable sys.path is a list of strings containing the Python search path. The code below displays the list and shows how to insert an additional directory. The python search path can also be extended by modifying the PYTHONPATH environment variable, e.g.: export PYTHONPATH=$PYTHONPATH:/home/User/SomeDir.
In [1]: import sys In [2]: sys.path Out[2]: [”, '/usr/bin', '/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/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode', '/usr/lib/python2.7/dist-packages/IPython/extensions'] In [3]: sys.path.insert( 0, "/home/User/someDir") In [4]: sys.path Out[4]: ['/home/User/someDir', ”, '/usr/bin', '/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/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode', '/usr/lib/python2.7/dist-packages/IPython/extensions']