There are SFTP client to do the work manually, like this one: http://comtechies.com/how-to-upload-and-download-files-in-amazon-aws-ec2-instance.html
But, wondering how can it be done using Python in Python Script ? (apart from creating a batch file...)
EDIT: As mentionned, in the comments, this one exists : SFTP in Python? (platform independent)
But, it does not solve the issue of authentification with EC2 Instance.
Thanks, regards