Environment Variables

import os;
for variable in sorted(os.environ): print variable;

# Environment Variables List (WIN Maya2018)
ADSK_CLM_WPAD_PROXY_CHECK
ALLUSERSPROFILE
APPDATA
ARNOLD_PLUGIN_PATH
ASL.LOG
ATF_LOCATION
AUTOLOADER_LAPS
BIFROST_LOCATION
COMMONPROGRAMFILES
COMMONPROGRAMFILES(X86)
COMMONPROGRAMW6432
COMPUTERNAME
COMSPEC
DRIVERDATA
FBX_LOCATION
FPS_BROWSER_APP_PROFILE_STRING
FPS_BROWSER_USER_PROFILE_STRING
HOME
HOMEDRIVE
HOMEPATH
LOCALAPPDATA
LOGONSERVER
MASH_LOCATION
MAYA_APP_DIR
MAYA_CONTENT_PATH
MAYA_CUSTOM_TEMPLATE_PATH
MAYA_ENABLE_LEGACY_VIEWPORT
MAYA_FBX_PLUGIN_LOCATION
MAYA_LOCATION
MAYA_MODULE_PATH
MAYA_MODULE_UI_WORKSPACE_PATH
MAYA_PLUG_IN_PATH
MAYA_PLUG_IN_RESOURCE_PATH
MAYA_PRESET_PATH
MAYA_RENDER_DESC_PATH
MAYA_REVERSE_FILEFORMAT_EXT
MAYA_SCRIPT_BASE
MAYA_SCRIPT_PATH
MAYA_UI_LANGUAGE
MTOA_EXTENSIONS_PATH
MTOA_PATH
NUMBER_OF_PROCESSORS
ONEDRIVE
ONEDRIVECONSUMER
OS
PATH
PATHEXT
PROCESSOR_ARCHITECTURE
PROCESSOR_IDENTIFIER
PROCESSOR_LEVEL
PROCESSOR_REVISION
PROGRAMDATA
PROGRAMFILES
PROGRAMFILES(X86)
PROGRAMW6432
PSMODULEPATH
PUBLIC
PYTHONPATH
QT_HARFBUZZ
QT_MAC_DONT_OVERRIDE_CTRL_LMB
SESSIONNAME
SUBSTANCES_LOCATION
SYSTEMDRIVE
SYSTEMROOT
TEMP
TMP
TMPDIR
USER
USERDOMAIN
USERDOMAIN_ROAMINGPROFILE
USERNAME
USERPROFILE
WF_IMF_CIN_CORRECTION
WF_IMF_CIN_WHITE_POINT
WF_IMF_SGI_MATTE
WINDIR
XBMLANGPATH
XGEN_LOCATION
XGEN_ROOT
##########
for item in sorted(os.environ["MAYA_SCRIPT_PATH"].split(";")): print item;

C:/Program Files/Autodesk/Bifrost/Maya2018/scripts
C:/Program Files/Autodesk/Bifrost/Maya2018/scripts/boss
C:/Program Files/Autodesk/Bifrost/Maya2018/scripts/presets
C:/Users/[user login name]/Documents/maya/2018/prefs/markingMenus
C:/Users/[user login name]/Documents/maya/2018/prefs/scripts
C:/Users/[user login name]/Documents/maya/2018/prefs/shelves
C:/Users/[user login name]/Documents/maya/2018/presets
C:/Users/[user login name]/Documents/maya/2018/scripts
C:/Users/[user login name]/Documents/maya/scripts
C:/solidangle/mtoadeploy/2018/scripts
C:/solidangle/mtoadeploy/2018/scripts/mtoa/mel
D:/Documents/maya/Projects
C:/Program Files/Autodesk/Maya2018/plug-ins/ATF/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/MASH
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/MASHAET
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/MayaToAE
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/apiclient
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/flux
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/flux/ae
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/flux/resources
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/flux/resources/icons
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/flux/ui
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/googleapiclient
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/httplib2
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/oauth2client
C:/Program Files/Autodesk/Maya2018/plug-ins/MASH/scripts/uritemplate
C:/Program Files/Autodesk/Maya2018/plug-ins/camd/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/camd/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/camd/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/fbx/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/substance/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/cafm
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui/ae
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui/brushes
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui/dialogs
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui/fxmodules
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui/tabs
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui/util
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/ui/widgets
C:/Program Files/Autodesk/Maya2018/plug-ins/xgen/scripts/xgenm/xmaya
C:/Program Files/Autodesk/Maya2018/scripts
C:/Program Files/Autodesk/Maya2018/scripts/AETemplates
C:/Program Files/Autodesk/Maya2018/scripts/FBX
C:/Program Files/Autodesk/Maya2018/scripts/cloth
C:/Program Files/Autodesk/Maya2018/scripts/fluidEffects
C:/Program Files/Autodesk/Maya2018/scripts/fur
C:/Program Files/Autodesk/Maya2018/scripts/hair
C:/Program Files/Autodesk/Maya2018/scripts/live
C:/Program Files/Autodesk/Maya2018/scripts/mayaHIK
C:/Program Files/Autodesk/Maya2018/scripts/muscle
C:/Program Files/Autodesk/Maya2018/scripts/others
C:/Program Files/Autodesk/Maya2018/scripts/paintEffects
C:/Program Files/Autodesk/Maya2018/scripts/shelves
C:/Program Files/Autodesk/Maya2018/scripts/startup
C:/Program Files/Autodesk/Maya2018/scripts/turtle
C:/Program Files/Autodesk/Maya2018/scripts/unsupported