Set the variables at the top and connect to a desired cloud via `boto` library.

generic_cloud_connect.py

import boto
import boto.s3.connection
from boto.ec2.regioninfo import RegionInfo

# Provide access info for your cloud and your account
A_KEY = ""
S_KEY = ""
region_name = 'Chameleon'
region_endpoint = 'openstack.tacc.chameleoncloud.org'
ec2_conn_path = "/services/Cloud"
ec2_port = 8773
is_secure = True
s3_host = 'openstack.tacc.chameleoncloud.org'
s3_port = 8888
s3_conn_path = '/'

# Create a connection object for the EC2 service (i.e., VM instances)
r = RegionInfo(name=region_name, endpoint=region_endpoint)
ec2_conn = boto.connect_ec2(aws_access_key_id=A_KEY,
                            aws_secret_access_key=S_KEY,
                            is_secure=is_secure,
                            region=r,
                            port=ec2_port,
                            path=ec2_conn_path,
                            validate_certs=False)

# Create a connection object for the S3 service (i.e., object store)
calling_format = boto.s3.connection.OrdinaryCallingFormat()
s3_conn = boto.connect_s3(aws_access_key_id=A_KEY,
                          aws_secret_access_key=S_KEY,
                          is_secure=is_secure,
                          host=s3_host,
                          port=s3_port,
                          calling_format=calling_format,
                          path=s3_conn_path)

# Test your connection and get an image ID
img_list = ec2_conn.get_all_images()
for img in img_list:
  print(img.id, img.name)

# Test the S3 connection as well
bl = s3_conn.get_all_buckets()