How do I get the Application ID at runtime

I need the Application ID to construct the correct <applicationid>.appspotmail.com address, and I'm having a hard time f开发者_如何学编程inding out how to retrieve it at runtime.

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The recommended approach now is to use app_identity.get_application_id():

http://code.google.com/appengine/docs/python/appidentity/functions.html#get_application_id

See the warning box here for details:

http://code.google.com/appengine/docs/python/runtime.html#Requests_and_Domains

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You can get it using:

os.environ['APPLICATION_ID']