How to sign amazon web service requests from the python app engine?

Question

I use Amazon web service api from within my Google app engine application. Amazon have said that they will only accept signed requests from Aug 15, 2009. While they have given

Answer 1

I wrote another simple example that uses only the core python 3 libraries (not boto) and uses version 2 of the AWS signature protocol:

http://xocoatl.blogspot.com/2011/03/signing-ec2-api-request-in-python.html

I know it won't work in GAE, but might be useful for anyone just looking for AWS authentication examples like I was.