aws hosts information for auto monitoring using python boto 1

import boto.ec2

conn=boto.ec2.connect_to_region('us-east-1')

reservations = conn.get_all_instances()
for res in reservations:
    for inst in res.instances:
        if 'Name' in inst.tags:
            print ("define host{")
            print ("use\tgeneric-host") # \t for tab
            print "%s  %s " % ("host_name", inst.tags['Name'])
            #print "%s "% (inst.tags['Name'])
            print "%s \t %s " % ("alias", inst.tags['Name'])
            print "%s  %s " % ("address", inst.public_dns_name)
            print(inst.instance_type)
            print ("}\n")
            #print "%s (%s) [%s] [%s]" % (inst.tags['Name'], inst.id, inst.state, inst.public_dns_name)
        else:
            print "%s [%s]" % (inst.id, inst.state)


######NOTE#########

I believe in the following script output you can see the output name " example: instance_type " so you can use the same for getting that information:

example: for my above script:
inst.public_dns_name will give public_dns_name
inst.region will give the region details and so..on

NOTE: To get the details of the instance that is part of a custom tags then:
reservations = conn.get_all_instances(filters={'tag-key': 'groups'})


############ external script ##############

from pprint import pprint
from boto import ec2

AWS_ACCESS_KEY_ID = 'XXXXXXXXXXXXXXXXXX'
AWS_SECRET_ACCESS_KEY = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'

ec2conn = ec2.connection.EC2Connection(AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY)
reservations = ec2conn.get_all_instances()
instances = [i for r in reservations for i in r.instances]
for i in instances:
    pprint(i.__dict__)
    break # remove this to list all instances 

{'_in_monitoring_element': False,
 'ami_launch_index': u'0',
 'architecture': u'x86_64',
 'block_device_mapping': {},
 'connection': EC2Connection:ec2.amazonaws.com,
 'dns_name': u'ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com',
 'id': u'i-xxxxxxxx',
 'image_id': u'ami-xxxxxxxx',
 'instanceState': u'\n                    ',
 'instance_class': None,
 'instance_type': u'm1.large',
 'ip_address': u'xxx.xxx.xxx.xxx',
 'item': u'\n                ',
 'kernel': None,
 'key_name': u'FARM-xxxx',
 'launch_time': u'2009-10-27T17:10:22.000Z',
 'monitored': False,
 'monitoring': u'\n                    ',
 'persistent': False,
 'placement': u'us-east-1d',
 'previous_state': None,
 'private_dns_name': u'ip-10-xxx-xxx-xxx.ec2.internal',
 'private_ip_address': u'10.xxx.xxx.xxx',
 'product_codes': [],
 'public_dns_name': u'ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com',
 'ramdisk': None,
 'reason': '',
 'region': RegionInfo:us-east-1,
 'requester_id': None,
 'rootDeviceType': u'instance-store',
 'root_device_name': None,
 'shutdown_state': None,
 'spot_instance_request_id': None,
 'state': u'running',
 'state_code': 16,
 'subnet_id': None,
 'vpc_id': None} 

External Links:
http://www.saltycrane.com/blog/2010/03/how-list-attributes-ec2-instance-python-and-boto/