These are the resource's available collections:
classic_addresses
dhcp_options_sets
images
instances
internet_gateways
key_pairs
network_acls
network_interfaces
placement_groups
route_tables
security_groups
snapshots
subnets
volumes
vpc_addresses
vpc_peering_connections
vpcs
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http://boto3.readthedocs.io/en/latest/reference/services/ec2.html#service-resource