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395 lines
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这个文档所针对的是一个已不再受支持的 Python 旧版本。
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你应当升级版本，并阅读
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<h1 id="index">索引 – 环</h1>
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<table style="width: 100%" class="indextable"><tr>
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<td style="width: 33%; vertical-align: top;"><ul>
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环境变量
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<li><a href="whatsnew/2.6.html#index-5">APPDATA</a>
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<li><a href="library/webbrowser.html#index-8">BROWSER</a>, <a href="library/webbrowser.html#index-9">[1]</a>
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<li><a href="whatsnew/2.3.html#index-24">CC</a>
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<li><a href="install/index.html#index-10">CFLAGS</a>, <a href="install/index.html#index-9">[1]</a>, <a href="whatsnew/2.3.html#index-25">[2]</a>
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<li><a href="library/curses.html#index-22">COLS</a>, <a href="whatsnew/3.5.html#index-32">[1]</a>
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<li><a href="library/curses.html#index-24">COLUMNS</a>, <a href="library/curses.html#index-26">[1]</a>
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<li><a href="library/os.html#index-78">COMSPEC</a>, <a href="library/subprocess.html#index-8">[1]</a>
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</li>
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<li><a href="whatsnew/2.3.html#index-26">CPP</a>
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</li>
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<li><a href="whatsnew/2.3.html#index-28">CPPFLAGS</a>
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</li>
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<li><a href="distutils/setupscript.html#index-2">DISTUTILS_DEBUG</a>
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</li>
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<li><a href="c-api/intro.html#index-48">exec_prefix</a>, <a href="c-api/intro.html#index-51">[1]</a>, <a href="using/unix.html#index-7">[2]</a>
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<li><a href="distutils/apiref.html#index-1">HOME</a>, <a href="install/index.html#index-4">[1]</a>, <a href="install/index.html#index-5">[2]</a>, <a href="library/os.path.html#index-14">[3]</a>, <a href="library/os.path.html#index-18">[4]</a>, <a href="whatsnew/3.8.html#index-67">[5]</a>, <a href="whatsnew/3.8.html#index-74">[6]</a>, <a href="whatsnew/changelog.html#index-5">[7]</a>, <a href="whatsnew/changelog.html#index-6">[8]</a>
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<li><a href="install/index.html#index-7">HOMEDRIVE</a>, <a href="library/os.path.html#index-17">[1]</a>
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</li>
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<li><a href="install/index.html#index-8">HOMEPATH</a>, <a href="library/os.path.html#index-16">[1]</a>
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</li>
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<li><a href="howto/urllib2.html#index-11">http_proxy</a>, <a href="library/urllib.request.html#index-25">[1]</a>, <a href="library/urllib.request.html#index-34">[2]</a>
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<li><a href="library/idle.html#index-9">IDLESTARTUP</a>, <a href="whatsnew/changelog.html#index-26">[1]</a>, <a href="whatsnew/changelog.html#index-31">[2]</a>, <a href="whatsnew/changelog.html#index-56">[3]</a>
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</li>
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<li><a href="library/webbrowser.html#index-10">KDEDIR</a>
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</li>
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<li><a href="library/gettext.html#index-23">LANG</a>, <a href="library/gettext.html#index-27">[1]</a>, <a href="library/locale.html#index-12">[2]</a>, <a href="library/locale.html#index-13">[3]</a>, <a href="library/locale.html#index-14">[4]</a>
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</li>
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<li><a href="library/gettext.html#index-20">LANGUAGE</a>, <a href="library/gettext.html#index-24">[1]</a>
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</li>
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<li><a href="library/gettext.html#index-21">LC_ALL</a>, <a href="library/gettext.html#index-25">[1]</a>
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</li>
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<li><a href="library/gettext.html#index-22">LC_MESSAGES</a>, <a href="library/gettext.html#index-26">[1]</a>
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<li><a href="whatsnew/2.7.html#index-12">LDCXXSHARED</a>
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</li>
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<li><a href="whatsnew/2.3.html#index-27">LDFLAGS</a>
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</li>
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<li><a href="library/curses.html#index-18">LINES</a>, <a href="library/curses.html#index-21">[1]</a>, <a href="library/curses.html#index-23">[2]</a>, <a href="library/curses.html#index-25">[3]</a>, <a href="whatsnew/3.5.html#index-31">[4]</a>
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<li><a href="library/getpass.html#index-10">LNAME</a>
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<li><a href="library/getpass.html#index-8">LOGNAME</a>, <a href="library/os.html#index-64">[1]</a>
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</li>
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<li><a href="library/ossaudiodev.html#index-5">MIXERDEV</a>
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<li><a href="library/urllib.request.html#index-29">no_proxy</a>
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<li><a href="library/pydoc.html#index-5">PAGER</a>
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<li><a href="c-api/intro.html#index-54">PATH</a>, <a href="c-api/intro.html#index-55">[1]</a>, <a href="faq/library.html#index-4">[2]</a>, <a href="faq/library.html#index-5">[3]</a>, <a href="library/cgi.html#index-11">[4]</a>, <a href="library/cgi.html#index-9">[5]</a>, <a href="library/os.html#index-70">[6]</a>, <a href="library/os.html#index-71">[7]</a>, <a href="library/os.html#index-72">[8]</a>, <a href="library/os.html#index-73">[9]</a>, <a href="library/os.html#index-74">[10]</a>, <a href="library/os.html#index-75">[11]</a>, <a href="library/os.html#index-76">[12]</a>, <a href="library/os.html#index-77">[13]</a>, <a href="library/os.html#index-80">[14]</a>, <a href="library/site.html#index-18">[15]</a>, <a href="library/webbrowser.html#index-11">[16]</a>, <a href="tutorial/appendix.html#index-4">[17]</a>, <a href="tutorial/modules.html#index-15">[18]</a>, <a href="using/cmdline.html#index-118">[19]</a>, <a href="using/unix.html#index-8">[20]</a>, <a href="using/windows.html#index-57">[21]</a>, <a href="using/windows.html#index-58">[22]</a>, <a href="using/windows.html#index-59">[23]</a>, <a href="using/windows.html#index-61">[24]</a>, <a href="using/windows.html#index-62">[25]</a>, <a href="using/windows.html#index-64">[26]</a>, <a href="using/windows.html#index-65">[27]</a>, <a href="using/windows.html#index-66">[28]</a>, <a href="using/windows.html#index-70">[29]</a>, <a href="using/windows.html#index-72">[30]</a>, <a href="using/windows.html#index-73">[31]</a>, <a href="using/windows.html#index-74">[32]</a>, <a href="using/windows.html#index-75">[33]</a>, <a href="whatsnew/3.4.html#index-55">[34]</a>, <a href="whatsnew/3.4.html#index-58">[35]</a>, <a href="whatsnew/3.4.html#index-59">[36]</a>, <a href="whatsnew/3.8.html#index-75">[37]</a>, <a href="whatsnew/changelog.html#index-13">[38]</a>, <a href="whatsnew/changelog.html#index-14">[39]</a>
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</li>
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<li><a href="using/windows.html#index-60">PATHEXT</a>, <a href="whatsnew/3.4.html#index-51">[1]</a>, <a href="whatsnew/changelog.html#index-2">[2]</a>
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</li>
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<li><a href="whatsnew/changelog.html#index-9">PIP_USER</a>
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</li>
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<li><a href="distutils/apiref.html#index-2">PLAT</a>
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</li>
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<li><a href="library/getopt.html#index-2">POSIXLY_CORRECT</a>
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</li>
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<li><a href="c-api/intro.html#index-47">prefix</a>, <a href="c-api/intro.html#index-49">[1]</a>, <a href="c-api/intro.html#index-50">[2]</a>, <a href="using/unix.html#index-6">[3]</a>
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</li>
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<li><a href="using/windows.html#index-76">PY_PYTHON</a>
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</li>
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<li><a href="c-api/init.html#index-70">PYTHON*</a>, <a href="using/cmdline.html#index-100">[1]</a>, <a href="using/cmdline.html#index-90">[2]</a>, <a href="using/cmdline.html#index-92">[3]</a>, <a href="using/cmdline.html#index-95">[4]</a>, <a href="whatsnew/3.4.html#index-50">[5]</a>
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</li>
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<li><a href="library/xml.dom.html#index-2">PYTHON_DOM</a>
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</li>
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<li><a href="library/asyncio-dev.html#index-2">PYTHONASYNCIODEBUG</a>, <a href="library/asyncio-eventloop.html#index-17">[1]</a>, <a href="using/cmdline.html#envvar-PYTHONASYNCIODEBUG">[2]</a>
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</li>
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<li><a href="library/sys.html#index-68">PYTHONBREAKPOINT</a>, <a href="library/sys.html#index-69">[1]</a>, <a href="library/sys.html#index-70">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONBREAKPOINT">[3]</a>, <a href="whatsnew/3.7.html#index-90">[4]</a>
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</li>
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<li><a href="using/cmdline.html#envvar-PYTHONCASEOK">PYTHONCASEOK</a>, <a href="whatsnew/2.1.html#index-47">[1]</a>
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</li>
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<li><a href="c-api/init_config.html#index-7">PYTHONCOERCECLOCALE</a>, <a href="using/cmdline.html#envvar-PYTHONCOERCECLOCALE">[1]</a>, <a href="using/cmdline.html#index-133">[2]</a>, <a href="whatsnew/3.7.html#index-82">[3]</a>
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</li>
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<li><a href="c-api/init.html#index-66">PYTHONDEBUG</a>, <a href="using/cmdline.html#envvar-PYTHONDEBUG">[1]</a>, <a href="using/cmdline.html#index-94">[2]</a>
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</li>
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<li><a href="library/development.html#index-2">PYTHONDEVMODE</a>, <a href="using/cmdline.html#envvar-PYTHONDEVMODE">[1]</a>, <a href="whatsnew/3.7.html#index-104">[2]</a>
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</li>
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<li><a href="library/pydoc.html#index-6">PYTHONDOCS</a>
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</li>
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<li><a href="c-api/init.html#index-67">PYTHONDONTWRITEBYTECODE</a>, <a href="faq/programming.html#index-9">[1]</a>, <a href="library/sys.html#index-71">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONDONTWRITEBYTECODE">[3]</a>, <a href="using/cmdline.html#index-93">[4]</a>, <a href="whatsnew/2.6.html#index-20">[5]</a>, <a href="whatsnew/2.6.html#index-24">[6]</a>
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</li>
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<li><a href="c-api/typeobj.html#index-0">PYTHONDUMPREFS</a>, <a href="using/cmdline.html#envvar-PYTHONDUMPREFS">[1]</a>, <a href="whatsnew/3.8.html#index-56">[2]</a>, <a href="whatsnew/changelog.html#index-16">[3]</a>
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</li>
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<li><a href="using/cmdline.html#envvar-PYTHONEXECUTABLE">PYTHONEXECUTABLE</a>
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</li>
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<li><a href="library/faulthandler.html#index-2">PYTHONFAULTHANDLER</a>, <a href="using/cmdline.html#envvar-PYTHONFAULTHANDLER">[1]</a>, <a href="whatsnew/3.3.html#index-24">[2]</a>
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</li>
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<li><a href="c-api/init.html#index-68">PYTHONHASHSEED</a>, <a href="c-api/init.html#index-69">[1]</a>, <a href="reference/datamodel.html#index-117">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONHASHSEED">[3]</a>, <a href="using/cmdline.html#index-106">[4]</a>, <a href="using/cmdline.html#index-107">[5]</a>, <a href="using/cmdline.html#index-123">[6]</a>, <a href="whatsnew/3.3.html#index-23">[7]</a>, <a href="whatsnew/3.3.html#index-80">[8]</a>, <a href="whatsnew/changelog.html#index-37">[9]</a>
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</li>
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<li><a href="c-api/init.html#index-72">PYTHONHOME</a>, <a href="c-api/init.html#index-84">[1]</a>, <a href="c-api/init.html#index-85">[2]</a>, <a href="c-api/init_config.html#index-2">[3]</a>, <a href="c-api/intro.html#index-56">[4]</a>, <a href="c-api/intro.html#index-58">[5]</a>, <a href="install/index.html#index-0">[6]</a>, <a href="install/index.html#index-1">[7]</a>, <a href="library/test.html#index-12">[8]</a>, <a href="using/cmdline.html#envvar-PYTHONHOME">[9]</a>, <a href="using/cmdline.html#index-116">[10]</a>, <a href="using/cmdline.html#index-117">[11]</a>, <a href="using/cmdline.html#index-120">[12]</a>, <a href="using/cmdline.html#index-97">[13]</a>, <a href="using/windows.html#index-78">[14]</a>, <a href="using/windows.html#index-80">[15]</a>, <a href="using/windows.html#index-82">[16]</a>, <a href="whatsnew/3.6.html#index-79">[17]</a>
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</li>
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<li><a href="c-api/init.html#index-73">PYTHONINSPECT</a>, <a href="using/cmdline.html#envvar-PYTHONINSPECT">[1]</a>, <a href="using/cmdline.html#index-99">[2]</a>, <a href="whatsnew/2.3.html#index-29">[3]</a>
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</li>
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<li><a href="library/stdtypes.html#index-72">PYTHONINTMAXSTRDIGITS</a>, <a href="library/stdtypes.html#index-73">[1]</a>, <a href="library/sys.html#index-79">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONINTMAXSTRDIGITS">[3]</a>, <a href="using/cmdline.html#index-112">[4]</a>, <a href="whatsnew/changelog.html#index-0">[5]</a>
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</li>
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<li><a href="c-api/init.html#index-82">PYTHONIOENCODING</a>, <a href="c-api/init.html#index-83">[1]</a>, <a href="library/sys.html#index-92">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONIOENCODING">[3]</a>, <a href="using/cmdline.html#index-129">[4]</a>, <a href="using/cmdline.html#index-132">[5]</a>, <a href="whatsnew/2.6.html#index-21">[6]</a>, <a href="whatsnew/3.4.html#index-159">[7]</a>
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</li>
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<li><a href="c-api/init.html#index-74">PYTHONLEGACYWINDOWSFSENCODING</a>, <a href="library/sys.html#index-90">[1]</a>, <a href="using/cmdline.html#envvar-PYTHONLEGACYWINDOWSFSENCODING">[2]</a>, <a href="whatsnew/3.6.html#index-96">[3]</a>
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</li>
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<li><a href="c-api/init.html#index-76">PYTHONLEGACYWINDOWSSTDIO</a>, <a href="library/sys.html#index-94">[1]</a>, <a href="using/cmdline.html#envvar-PYTHONLEGACYWINDOWSSTDIO">[2]</a>, <a href="using/cmdline.html#index-124">[3]</a>, <a href="whatsnew/3.6.html#index-98">[4]</a>
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</li>
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<li><a href="c-api/memory.html#index-11">PYTHONMALLOC</a>, <a href="c-api/memory.html#index-12">[1]</a>, <a href="c-api/memory.html#index-9">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONMALLOC">[3]</a>, <a href="using/cmdline.html#index-127">[4]</a>, <a href="whatsnew/3.6.html#index-104">[5]</a>, <a href="whatsnew/3.6.html#index-114">[6]</a>, <a href="whatsnew/changelog.html#index-86">[7]</a>
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</li>
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<li><a href="c-api/memory.html#index-10">PYTHONMALLOCSTATS</a>, <a href="using/cmdline.html#envvar-PYTHONMALLOCSTATS">[1]</a>, <a href="whatsnew/changelog.html#index-87">[2]</a>
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</li>
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<li><a href="c-api/init.html#index-78">PYTHONNOUSERSITE</a>, <a href="library/site.html#index-20">[1]</a>, <a href="using/cmdline.html#envvar-PYTHONNOUSERSITE">[2]</a>, <a href="whatsnew/2.6.html#index-6">[3]</a>
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</li>
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<li><a href="c-api/init.html#index-79">PYTHONOPTIMIZE</a>, <a href="using/cmdline.html#envvar-PYTHONOPTIMIZE">[1]</a>, <a href="using/cmdline.html#index-102">[2]</a>
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</li>
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<li><a href="c-api/init.html#index-71">PYTHONPATH</a>, <a href="c-api/init_config.html#index-3">[1]</a>, <a href="c-api/intro.html#index-57">[2]</a>, <a href="c-api/intro.html#index-59">[3]</a>, <a href="extending/building.html#index-4">[4]</a>, <a href="install/index.html#index-2">[5]</a>, <a href="install/index.html#index-3">[6]</a>, <a href="library/cgi.html#index-10">[7]</a>, <a href="library/sys.html#index-83">[8]</a>, <a href="library/sys.html#index-84">[9]</a>, <a href="library/test.html#index-13">[10]</a>, <a href="tutorial/modules.html#index-14">[11]</a>, <a href="tutorial/modules.html#index-17">[12]</a>, <a href="tutorial/modules.html#index-18">[13]</a>, <a href="using/cmdline.html#envvar-PYTHONPATH">[14]</a>, <a href="using/cmdline.html#index-119">[15]</a>, <a href="using/cmdline.html#index-121">[16]</a>, <a href="using/cmdline.html#index-122">[17]</a>, <a href="using/cmdline.html#index-96">[18]</a>, <a href="using/mac.html#index-2">[19]</a>, <a href="using/windows.html#index-63">[20]</a>, <a href="using/windows.html#index-77">[21]</a>, <a href="using/windows.html#index-79">[22]</a>, <a href="using/windows.html#index-81">[23]</a>, <a href="whatsnew/3.4.html#index-56">[24]</a>, <a href="whatsnew/3.4.html#index-57">[25]</a>
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</li>
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<li><a href="using/cmdline.html#envvar-PYTHONPROFILEIMPORTTIME">PYTHONPROFILEIMPORTTIME</a>, <a href="using/cmdline.html#index-113">[1]</a>, <a href="whatsnew/3.7.html#index-105">[2]</a>, <a href="whatsnew/changelog.html#index-45">[3]</a>
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</li>
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<li><a href="library/sys.html#index-72">PYTHONPYCACHEPREFIX</a>, <a href="using/cmdline.html#envvar-PYTHONPYCACHEPREFIX">[1]</a>, <a href="using/cmdline.html#index-115">[2]</a>, <a href="whatsnew/3.8.html#index-55">[3]</a>, <a href="whatsnew/changelog.html#index-18">[4]</a>
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</li>
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<li><a href="whatsnew/2.7.html#index-15">PYTHONSHOWALLOCCOUNT</a>
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</li>
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<li><a href="whatsnew/2.7.html#index-14">PYTHONSHOWREFCOUNT</a>
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</li>
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<li><a href="library/idle.html#index-10">PYTHONSTARTUP</a>, <a href="library/readline.html#index-2">[1]</a>, <a href="library/site.html#index-19">[2]</a>, <a href="library/sys.html#index-80">[3]</a>, <a href="tutorial/appendix.html#index-5">[4]</a>, <a href="using/cmdline.html#envvar-PYTHONSTARTUP">[5]</a>, <a href="using/cmdline.html#index-98">[6]</a>, <a href="whatsnew/3.4.html#index-150">[7]</a>, <a href="whatsnew/3.4.html#index-151">[8]</a>, <a href="whatsnew/changelog.html#index-27">[9]</a>, <a href="whatsnew/changelog.html#index-32">[10]</a>, <a href="whatsnew/changelog.html#index-57">[11]</a>
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</li>
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<li><a href="using/cmdline.html#envvar-PYTHONTHREADDEBUG">PYTHONTHREADDEBUG</a>
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</li>
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<li><a href="library/tracemalloc.html#index-0">PYTHONTRACEMALLOC</a>, <a href="library/tracemalloc.html#index-1">[1]</a>, <a href="library/tracemalloc.html#index-2">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONTRACEMALLOC">[3]</a>
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<li><a href="c-api/init.html#index-80">PYTHONUNBUFFERED</a>, <a href="using/cmdline.html#envvar-PYTHONUNBUFFERED">[1]</a>, <a href="using/cmdline.html#index-109">[2]</a>
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<li><a href="library/site.html#index-21">PYTHONUSERBASE</a>, <a href="library/site.html#index-22">[1]</a>, <a href="using/cmdline.html#envvar-PYTHONUSERBASE">[2]</a>, <a href="whatsnew/2.6.html#index-4">[3]</a>
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</li>
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<li><a href="library/test.html#index-14">PYTHONUSERSITE</a>
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<li><a href="c-api/init_config.html#index-6">PYTHONUTF8</a>, <a href="library/sys.html#index-93">[1]</a>, <a href="using/cmdline.html#envvar-PYTHONUTF8">[2]</a>, <a href="using/cmdline.html#index-114">[3]</a>, <a href="using/cmdline.html#index-130">[4]</a>, <a href="using/windows.html#index-67">[5]</a>, <a href="whatsnew/3.7.html#index-86">[6]</a>
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</li>
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<li><a href="c-api/init.html#index-81">PYTHONVERBOSE</a>, <a href="using/cmdline.html#envvar-PYTHONVERBOSE">[1]</a>, <a href="using/cmdline.html#index-110">[2]</a>
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<li><a href="library/warnings.html#index-7">PYTHONWARNINGS</a>, <a href="library/warnings.html#index-8">[1]</a>, <a href="library/warnings.html#index-9">[2]</a>, <a href="using/cmdline.html#envvar-PYTHONWARNINGS">[3]</a>, <a href="using/cmdline.html#index-111">[4]</a>, <a href="whatsnew/2.7.html#index-40">[5]</a>, <a href="whatsnew/2.7.html#index-8">[6]</a>, <a href="whatsnew/3.2.html#index-10">[7]</a>, <a href="whatsnew/3.7.html#index-114">[8]</a>
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<li><a href="library/compileall.html#index-9">SOURCE_DATE_EPOCH</a>, <a href="library/py_compile.html#index-17">[1]</a>, <a href="library/py_compile.html#index-20">[2]</a>, <a href="library/py_compile.html#index-21">[3]</a>, <a href="whatsnew/3.7.html#index-109">[4]</a>, <a href="whatsnew/changelog.html#index-20">[5]</a>, <a href="whatsnew/changelog.html#index-36">[6]</a>
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</li>
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<li><a href="library/ssl.html#index-68">SSL_CERT_FILE</a>
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</li>
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<li><a href="library/ssl.html#index-69">SSL_CERT_PATH</a>
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</li>
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<li><a href="library/ssl.html#index-52">SSLKEYLOGFILE</a>, <a href="library/ssl.html#index-53">[1]</a>
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<li><a href="library/subprocess.html#index-9">SystemRoot</a>
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<li><a href="faq/gui.html#index-4">TCL_LIBRARY</a>
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<li><a href="library/tempfile.html#index-8">TEMP</a>
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<li><a href="library/curses.html#index-19">TERM</a>, <a href="library/curses.html#index-20">[1]</a>
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<li><a href="faq/gui.html#index-5">TK_LIBRARY</a>
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<li><a href="library/tempfile.html#index-9">TMP</a>
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<li><a href="library/tempfile.html#index-7">TMPDIR</a>
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<li><a href="library/time.html#index-37">TZ</a>, <a href="library/time.html#index-38">[1]</a>, <a href="library/time.html#index-39">[2]</a>, <a href="library/time.html#index-40">[3]</a>, <a href="library/time.html#index-41">[4]</a>, <a href="library/time.html#index-42">[5]</a>
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<li><a href="library/getpass.html#index-9">USER</a>
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<li><a href="whatsnew/2.7.html#index-9">USER_BASE</a>
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</li>
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<li><a href="library/getpass.html#index-11">USERNAME</a>, <a href="library/os.html#index-65">[1]</a>
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</li>
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<li><a href="install/index.html#index-6">USERPROFILE</a>, <a href="library/os.path.html#index-15">[1]</a>, <a href="whatsnew/3.8.html#index-66">[2]</a>, <a href="whatsnew/3.8.html#index-73">[3]</a>, <a href="whatsnew/changelog.html#index-4">[4]</a>
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</li>
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<li><a href="library/venv.html#index-8">VIRTUAL_ENV</a>
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</li>
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