“sys.path”报告的顺序是搜索包的顺序吗？

Python 中条目出现的顺序是sys.path对应于找到包的顺序？例如我有

>>> from pprint import pprint     
>>> pprint(sys.path)
['',
 '/Library/Python/2.7/site-packages/ipython-0.14.dev-py2.7.egg',
 '/Library/Python/2.7/site-packages/matplotlib-1.3.x-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/numpy-1.8.0.dev_3abd869_20121222-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/pymc-2.2-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/scikit_learn-0.13_git-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/scipy-0.12.0.dev_d631749_20121222-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/statsmodels-0.5.0-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/readline-6.2.4.1-py2.7-macosx-10.7-intel.egg',
 '/Library/Python/2.7/site-packages/nose-1.2.1-py2.7.egg',
 '/Library/Python/2.7/site-packages/six-1.2.0-py2.7.egg',
 '/Library/Python/2.7/site-packages/tornado-2.4.1-py2.7.egg',
 '/Library/Python/2.7/site-packages/pyzmq-2.2.0.1-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/patsy-0.1.0-py2.7.egg',
 '/Library/Python/2.7/site-packages/pip-1.2.1-py2.7.egg',
 '/Library/Python/2.7/site-packages/xattr-0.6.4-py2.7-macosx-10.8-intel.egg',
 '/Library/Python/2.7/site-packages/distribute-0.6.28-py2.7.egg',
 '/Library/Python/2.7/site-packages/astropy-0.3.dev2837-py2.7-macosx-10.8-intel.egg',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
 '/Library/Python/2.7/site-packages']

所以，一般来说，我有

['',
 '/Library/Python/2.7/site-packages/PKG_WITH_EGG.egg',
 ...
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
 ...
 '/Library/Python/2.7/site-packages']

这是否意味着如果我安装的软件包（在“site-packages”中）碰巧有一个.egg，它将取代可能位于“Extras”中的同一软件包的版本，但那些（在“site-packages”中）没有.egg将被“Extras”中的任何版本取代？