Python script to report instances by tag key.
Run the script without any arguments and it will query for EC2 instances, and sort them by the Owner tag.
$ get-instances-by-tag.py
Optionally, you can pass in -k or --key to sort by a different tag key. And finally, you can use -r to reverse
the sort order.
This script uses boto3, and you can override the credentials using environment variables (Boto3 Github Configuration)