In order to make certain guarantees about the hosted platform, not all
Python libraries can be used wholesale. Working to evolve Django seems
the best solution. Again, because of BigTable assumptions (good ones,
by the way) about data models not all functionality will map over
Django's relational-influenced API.
If I were a betting man, I'd wager that Django's core team was aware
of App Engine well before we all were. If not, the blessing of Google
in initial documentation is a huge incentive to get Django more App
Engine ready before other Python frameworks start popping up and
stealing the thunder.