detect dark, light, or auto mode

gistfile1.txt

>>> from SystemConfiguration import SCDynamicStoreCopyConsoleUser
>>> from CoreFoundation import CFPreferencesCopyAppValue
>>> from Foundation import NSHomeDirectoryForUser
>>> 
>>> user, uid, gid = SCDynamicStoreCopyConsoleUser(None, None, None)
>>> home = NSHomeDirectoryForUser(user)
>>> userfile = home + '/Library/Preferences/.GlobalPreferences.plist'
>>> keys = ['AppleInterfaceStyle', 'AppleInterfaceStyleSwitchesAutomatically']
# just loop and see what we get
>>> for k in keys:
...     print(CFPreferencesCopyAppValue(k, userfile))
... 
Dark
None
>>> 
# test for None values
>>> for k in keys:
...     result = CFPreferencesCopyAppValue(k, userfile)
...     if result is not None:
...         print(result)
... 
Dark
>>>