Python中的隐式模块搜索？

我正在更全面地了解Python虚拟环境，以了解廉价托管解决方案和开发平台的可移植性问题，还有一些我不理解的内容 .

我一直在构建虚拟环境，但是我没有看到将虚拟环境复制到主机所需的完全隔离，假设主机没有安装python

问题是我将构建一个与系统没有完全隔离的平台 P _ bin69/97-299-lib / python2.6 / site-packages

PATH被更改为仅包含P / bin /

PYTHONPATH是空白的

工作完美 . 但是，它仍然访问系统目录以解决虚拟环境中不存在的问题 . 为什么？？

在这种情况下 P = / tmp / pinax2 /`

import sys print sys.path

[''，'/ tmp /pinax2 / lib / python2.6 / site-package / setupupols.6.6c11-py2.6.egg'，'/ tmp / pinax2 / lib / python2.6 / site-package / pip- 0.8.1-py2.6.egg'，'/ home / marc / PythonPersonalWorkspace / mcapps / societysource'，'/ tmp / pinax2 / lib / python2.6'，'/ tmp / pinax2 / lib / python2.6 / plat -linux2'，'/ tmp / pinax2 / lib / python2.6 / lib -tk'，'/ tmp / pinax2 / lib / python2.6 / lib-old'，'/ tmp / pinax2 / lib / python2.6 / lib-dynload'，'/ usr / lib / python2.6'，'/ usr / lib / python2.6 / plat-linux2'，'/ usr / lib / python2.6 / lib -tk'，'/ tmp / pinax2 / lib / python2.6 / site-packages'，'/ usr / local / lib / python2.6 / dad-package / pydelicious-0.6-py2.6.egg'，'/ usr / local / lib / python2 . 6 / dist-packages / feedparser-4.1-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-package / nose-0.11.3-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / decorator-3.2.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-package / FormEncode-1.2.2-py2.6 .egg'，'/ usr / local / lib / python2.6 / dad-packages / PasteScript-1.7.3-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / PasteDeploy -1.3.3-py2.6.egg'，'/ usr / local / li b / python2.6 / dist-packages / Beaker-1.5.4-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages / Routes-1.12.3-py2.6.egg '，'/ usr / local / lib / python2.6 / did-package / doctils-0.4-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages /simplejson-2.0.9 -py2.6.egg'，'/ usr / local / lib / python2.6 / dad-package / WebHelpers-0.6.4-py2.6.egg'，'/ usr / local / lib / python2.6 / rem -packages / Mako-0.3.6-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-package / MarkupSafe-0.11-py2.6.egg'，'/ usr / local / lib /python2.6/dist-packages/Tempita-0.4-py2.6.egg','/usr/local/lib/python2.6/dist-packages/WebTest-1.2-py2.6.egg'，'/ usr /local/lib/python2.6/dist-packages/WebError-0.10.2-py2.6.egg','/usr/local/lib/python2.6/dist-packages/Pygments-1.3.1-py2 . 6.egg'，'/ usr / local / lib / python2.6 / did-package /AuthKit-0.4.5-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages / elementtree-1.2.7_20070827_preview-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-package /distribute-0.6.14-py2.6.egg'，'/ usr / local / lib / python2.6的/ DIST-包/ setuptools的-0.6c11-py2.5 .egg'，'/ usr / local / lib / python2.6 / dad-package /Myghty-1.2-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages / recaptcha_client-1.0 .5-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / pyfacebook-1.0a2-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / BeautifulSoup-3.2.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / flup-1.0.3.dev_20100525-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / JCC-1.9-py2.6-linux-i686.egg'，'/ usr / local / lib / python2.6 / decode-packages /mechanize-0.2.4 -py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages / Pylons-1.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dad -packages /pyparsing-1.5.5-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / python_dateutil-1.5-py2.6.egg'，'/ usr / local / lib / python2 .6 / dist-packages / z3ext.lucene-1.1.4-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-package / zope.app.catalog-3.8.1-py2 . 6.egg'，'/ usr / local / lib / python2.6 / dist-package / zope.app.container-3.9.1-py2.6.egg'，'/ usr / local / lib / python2.6 / DIST-包/ zope.app.pagetemplate-3.11.2-PY2 . 6.egg'，'/ usr / local / lib / python2.6 / dad-packages / zope.app.appsetup-3.15.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / zope.app.intid-3.7.1-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zope.app.twisted-3.5.0-py2.6 .egg'，'/ usr / local / lib / python2.6 / dist-packages / zope.i18nmessageid-3.5.3-py2.6-linux-i686.egg'，'/ usr / local / lib / python2.6 /dist-packages/zope.index-3.6.1-py2.6-linux-i686.egg','/usr/local/lib/python2.6/dist-packages/zope.proxy-3.6.1-py2 . 6-linux-i686.egg'，'/ usr / local / lib / python2.6 / decode-package / zope.schema-3.7.1-py2.6.egg'，'/ usr / local / lib / python2 . 6 / DIST-包/ zope.publisher-3.12.6-py2.6.egg”，'/usr/local/lib/python2.6/dist-packages/zope.component-3.10.0-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.catalog -3.8.1-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zope.app.publisher-3.10.2-py2.6.egg'，'/ usr / local /lib/python2.6/dist-packages/zope.traversing-3.13.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.size-3.4.1- py2.6.egg'，'/ usr / local / lib / python2.6 /dist-packages / zope.security-3.8.0-py2.6-linux-i686.egg'，'/ usr / local / lib / python2.6 / dist-packages / zope.location-3.9.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-package / zope.lifecycleevent-3.6.2-py2.6 .egg'，'/ usr / local / lib / python2.6 /dist-packages / zope.i18n-3.7.4-py2.6.egg'，'/ usr / local / lib / python2.6 / dad -packages /zope.exceptions-3.6.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.event-3.5.0_1-py2.6.egg'，'/ usr /local/lib/python2.6/dist-packages/zope.dublincore-3.8.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.copypastemove-3.8 . 0-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packageag es / zope.container-3.12.0-py2.6-linux-i686.egg'，'/ usr / local / lib / python2.6 / did-package / zope.browser-1.3-py2.6.egg'， '/usr/local/lib/python2.6/dist-packages/zope.tales-3.5.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.pagetemplate -3.5.2-py2.6.egg'，'/ usr / local / lib / python2.6 / decode-packages / zope.configuration-3.7.2-py2.6.egg'，'/ usr / local / lib /python2.6/dist-packages/zope.browserpage-3.12.2-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.site-3.9.2-py2 . 6.egg'，'/ usr / local / lib / python2.6 / dad-package / zope.session-3.9.3-py2.6.egg'，'/ usr / local / lib / python2.6 / record- packages / zope.processlifetime-1.0-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zope.error-3.7.2-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / zope.app.publication-3.12.0-py2.6.egg'，'/ usr / local / lib / python2.6 / record-packages / ZODB3-3.10.1 -py2.6-linux-i686.egg'，'/ usr / local / lib / python2.6 / decode-package / zope.intid-3.7.2-py2.6.egg'，'/ usr / local / lib /python2.6/dist-packages/zope.app.server-3.5.0-py2.6.egg'，' /usr/local/lib/python2.6/dist-packages/zope.app.wsgi-3.10.0-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope . app.applicationcontrol-3.5.9-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zdaemon-2.0.4-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / ZConfig-2.8.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-package / zope.contenttype-3.5.1-py2.6 .egg'，'/ usr / local / lib / python2.6 / dad-packages / zope.annotation-3.5.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dad -packages /zope.componentvocabulary-1.0.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.ptresource-3.9.0-py2.6.egg'，'/ usr /local/lib/python2.6/dist-packages/zope.datetime-3.4.0-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zope.browserresource-3.12 . 0-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zope.browsermenu-3.9.1-py2.6.egg'，'/ usr / local / lib / python2 . 6 / dist-packages / pytz-2010o-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zope.copy-3.5.0-py2.6.egg'，'/ USR / local / lib目录/ python2.6的/ DIST-包/ zope.b roken-3.6.0-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zope.filerepresentation-3.6.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / zope.dottedname-3.4.6-py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / zope.tal-3.5.2-py2 .6.egg'，'/ usr / local / lib / python2.6 / dad-packages / ResestedPython-3.6.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dad -packages /zope.hookable-3.4.1-py2.6-linux-i686.egg','/usr/local/lib/python2.6/dist-packages/zope.minmax-1.1.2-py2.6.egg' ，'/usr/local/lib/python2.6/dist-packages/zope.authentication-3.7.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/zc . lockfile-1.0.0-py2.6.egg'，'/ usr / local / lib / python2.6 / div-package / transaction-1.1.1-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / zope.keyreference-3.6.2-py2.6.egg'，'/ usr / local / lib / python2.6 / div-package / zope.password-3.6.1-py2.6 .egg'，'/ usr / local / lib / python2.6 / dist-packages / zope.server-3.8.2-py2.6.egg'，'/ usr / local / lib / python2.6 / dad -packages /zope.testing-3.10.2-py2.6.egg'，'/ usr / local / lib / p ython2.6 / dist-packages / zope.testbrowser-3.10.3-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages / swgi_intercept-0.4-py2.6.egg'， '/usr/local/lib/python2.6/dist-packages/zope.applicationcontrol-3.5.5-py2.6.egg','/usr/local/lib/python2.6/dist-packages/Paste-1.7 .3.1-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / SQLAlchemy-0.6.6-py2.6.egg'，'/ usr / local / lib / python2.6 /dist-packages/virtualenv-1.5.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/Reindent-0.1.1-py2.6.egg'，'/usr/local/lib/python2.6/dist-packages/roman-1.4.0-py2.6.egg','/usr/local/lib/python2.6/dist-packages/WebOb-1.0.1 -py2.6.egg'，'/ usr / local / lib / python2.6 / did-package / weakrefset-1.0.0-py2.6.egg'，'/ usr / local / lib / python2.6 / rem -packages / django_openid-0.1.5-py2.6.egg'，'/ usr / lib / pymodules / python2.6'，'/ usr / local / lib / python2.6 / dad-packages / django_extensions-0.6-py2 .6.egg'，'/ usr / local / lib / python2.6 / dist-packages / django_robots-0.8.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dad -packages /django_friends-0.1.5-py2.6.egg','/usr/local/lib/python2.6/dist-packages/django_mailer-0.1.0-py2.6.egg'，'/ usr / local / lib /python2.6/dist-packages/django_messages-0.4.4-py2.6.egg','/usr/local/lib/python2.6/dist-packages/django_announcements-0.1.2-py2.6.egg' ，'/usr/local/lib/python2.6/dist-packages/django_oembed-0.1.3-py2.6.egg','/usr/local/lib/python2.6/dist-packages/django_db_log-2.2 . 1-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages / django_pagination-1.0.7-py2.6.egg'，'/ usr / local / lib / python2.6 / DIST包年龄/ django_threadedcomments-0.5.3-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-packages / django_bookmarks-0.1.0-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / django_ajax_validation-0.1.3-py2.6.egg'，'/ usr / local / lib / python2.6 / dad-package / django_photologue-2.3-py2.6.egg'， '/usr/local/lib/python2.6/dist-packages/django_avatar-1.0.5-py2.6.egg','/usr/local/lib/python2.6/dist-packages/django_flag-0.1.1 -py2.6.egg'，'/ usr / local / lib / python2.6 /dist-packages / django_microblogging-0.1.2-py2.6.egg'，'/ usr / local / lib / python2.6 / rem -packages / django_locations-0.1.1-py2.6.egg'，'/ usr / local / lib / python2.6 / dist-packages / django_uni_form-0.7.0-py2.6.egg'，'/ usr / local /lib/python2.6/dist-packages/django_sorting-0.1-py2.6.egg','/usr/local/lib/python2.6/dist-packages/django_markup-0.3-py2.6.egg'，' /usr/local/lib/python2.6/dist-packages/django_staticfiles-0.3.4-py2.6.egg','/usr/local/lib/python2.6/dist-packages/django_email_confirmation-0.1.4- py2.6.egg'，'/ usr / local / lib / python2.6 / site-package'，'/ usr / loc al / lib / python2.6 / dist-packages'，'/ usr / lib / python2.6 / did-package'，'/ usr / lib / python2.6 / record-package / PIL'，'/ usr / lib /python2.6/dist-packages/gst-0.10','/usr/lib/python2.6/dist-packages/gtk-2.0'，'/ usr / lib / pymodules / python2.6 / gtk-2.0']

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