You can access the global environment variable CURRENT_VERSION_ID -
from the docs:

CURRENT_VERSION_ID: The major and minor version of the currently
running application, as "X.Y". The major version number ("X") is
specified in the app's app.yaml file. The minor version number ("Y")
is set automatically when each version of the app is uploaded to App
Engine. On the development web server, the minor version is always
"1".

I believe memcache and datastore are shared across all versions of the
app, so keep that in mind.

On Jul 6, 2:56 pm, mckoss <mck...@gmail.com> wrote:
> I'd like to be able to know what version of my application is
> currently running?  Is there an API for reading this string at
> runtime?
>
> (I want to use this for flushing cache entries from memcache that are
> version-specific).
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