Python的sys.path在哪里初始化？

Question

Python的sys.path在哪里初始化？Python的sys.path在哪里初始化？UPD：Python在引用PYTHONPATH之前添加了一些路径：    >>> import sys    >>> from pprint import pprint as p    >>> p(sys.path)     ['',      'C:\\Python25\\lib\\site-packages\\setuptools-0.6c9-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\orbited-0.7.8-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\morbid-0.8.6.1-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\demjson-1.4-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\stomper-0.2.2-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\uuid-1.30-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\stompservice-0.1.0-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\cherrypy-3.0.1-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\pyorbited-0.2.2-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\flup-1.0.1-py2.5.egg',      'C:\\Python25\\lib\\site-packages\\wsgilog-0.1-py2.5.egg',      'c:\\testdir',      'C:\\Windows\\system32\\python25.zip',      'C:\\Python25\\DLLs',      'C:\\Python25\\lib',      'C:\\Python25\\lib\\plat-win',      'C:\\Python25\\lib\\lib-tk',      'C:\\Python25',      'C:\\Python25\\lib\\site-packages',      'C:\\Python25\\lib\\site-packages\\PIL',      'C:\\Python25\\lib\\site-packages\\win32',      'C:\\Python25\\lib\\site-packages\\win32\\lib',      'C:\\Python25\\lib\\site-packages\\Pythonwin']我的PYTHONPATH是：    PYTHONPATH=c:\testdir我想知道PYTHONPATH之前的那些路径来自哪里？