How do I store desktop application data in a cross platform way for python?

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Well, I hate to have been the one to answer my own question, but no one else seems to know. I’m leaving the answer for posterity.

APPNAME = "MyApp"
import sys
from os import path, environ
if sys.platform == 'darwin':
    from AppKit import NSSearchPathForDirectoriesInDomains
    # http://developer.apple.com/DOCUMENTATION/Cocoa/Reference/Foundation/Miscellaneous/Foundation_Functions/Reference/reference.html#//apple_ref/c/func/NSSearchPathForDirectoriesInDomains
    # NSApplicationSupportDirectory = 14
    # NSUserDomainMask = 1
    # True for expanding the tilde into a fully qualified path
    appdata = path.join(NSSearchPathForDirectoriesInDomains(14, 1, True)[0], APPNAME)
elif sys.platform == 'win32':
    appdata = path.join(environ['APPDATA'], APPNAME)
else:
    appdata = path.expanduser(path.join("~", "." + APPNAME))

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