Python boto3 client exception

python-boto3client-exception.py

"""
===========================================
['Error']['Code'] e.g. 'EntityAlreadyExists' or 'ValidationError'
['ResponseMetadata']['HTTPStatusCode'] e.g. 400
['ResponseMetadata']['RequestId'] e.g. 'd2b06652-88d7-11e5-99d0-812348583a35'
['Error']['Message'] e.g. "An error occurred (EntityAlreadyExists) ..."
['Error']['Type'] e.g. 'Sender'
""""
import boto3
from botocore.exceptions import ClientError
try:
    iam = boto3.client('iam')
    user = iam.create_user(UserName='fred')
    print "Created user: %s" % user
except ClientError as e:
    if e.response['Error']['Code'] == 'EntityAlreadyExists':
        print "User already exists. Received error: %s", e, exc_info=True"
    else:
        print "Unexpected error: %s" % e
        raise