The Google Cloud Documentation page provides details on Python deployment on Google's App Engine, offering two Python language environments. Both environments support a code-centric developer workflow, scale efficiently to handle demand, and utilize Google’s serving technology, differing in certain ways. The standard environment scales nearly instantaneously to manage traffic spikes and offers a free tier but does not support Python 2.7 runtime, whereas the flexible environment can run any framework, library, or binary and allows access to the same Compute Engine network with no free tier.
Attachments - Google App Engine - Google Code
http://code.google.com/appengine/docs/python/mail/attachments.html