Catching boto3 ClientError subclass

Question

With code like the snippet below, we can catch AWS exceptions:

from aws_utils import make_session

session = make_session()
cf = session.resource(\"iam\")
ro         


        

Answer 1

If you're using the client you can catch the exceptions like this:

import boto3

def exists(role_name):
    client = boto3.client('iam')
    try:
        client.get_role(RoleName='foo')
        return True
    except client.exceptions.NoSuchEntityException:
        return False

Answer 2

  try:
      something 
 except client.exceptions.NoSuchEntityException:
      something

This worked for me

Answer 3

If you're using the resource you can catch the exceptions like this:

cf = session.resource("iam")
role = cf.Role("foo")
try:
    role.load()
except cf.meta.client.exceptions.NoSuchEntityException:
    # ignore the target exception
    pass

This combines the earlier answer with the simple trick of using .meta.client to get from the higher-level resource to the lower-level client.