Python Program for getting all the details of running instances and tagging the instances

GetAllInstances.py

__author__ = 'Amal G Jose'
import sys
import boto

class GetAllInstances(object):

    def __init__(self):
        self.aws_access_key = 'XXXXXXXXXXXXXXX'
        self.aws_secret_key = 'XXXXXXXXXXXXXXX'
        if self.aws_access_key == '' or self.aws_secret_key == '':
            print 'Enter AWS access key and Secret Key'
            exit()

    ##Method for getting the details of all the running instances
    def get_all_running_instances(self, region):
        try:
            ##Creating EC2 connection
            conn = boto.ec2.connect_to_region(region,
                aws_access_key_id=self.aws_access_key,
                aws_secret_access_key=self.aws_secret_key)

            ##List all running EC2 instances
            reservations = conn.get_all_reservations()
            for reservation in reservations:
                for instance in reservation.instances:
                    print region + ':', instance.id

            ##List all running volumes
            for volume in conn.get_all_volumes():
                print region + ':', volume.id
        except:
            print str(sys.exc_info()[0])

    ##Method for tagging all the instances
    def tag_all_instances(self, region):
        try:
            tags = {}
            tags['Name'] = 'CloudComputing'
            tags['Owner'] = 'Amal G Jose'
            conn = boto.ec2.connect_to_region(region,
                aws_access_key_id=self.aws_access_key,
                aws_secret_access_key=self.aws_secret_key)

            ##Tagging EC2 instances
            reservations = conn.get_all_reservations()
            for reservation in reservations:
                for instance in reservation.instances:
                    print "Tagging EC2 instance " + instance.id
                    conn.create_tags(instance.id, tags)

            ##Tagging Volumes
            for volume in conn.get_all_volumes():
                print "Tagging volume " + volume.id
                conn.create_tags(volume.id, tags)
        except:
            print str(sys.exc_info()[0])

    def main(self):
        try:
            regions = ['ap-southeast-1', 'ap-southeast-2', 'ap-northeast-1',
                       'us-east-1','us-west-1', 'us-west-2','eu-west-1', 'sa-east-1']
            for region in regions:
                self.get_all_running_instances(region)
                self.tag_all_instances(region)
        except:
            print str(sys.exc_info()[0])

if __name__ == '__main__':
    get_instance_details = GetAllInstances()
    get_instance_details.main()