title: How to use access credentials in code instead of environment variables with PynamoDB
body: <p>I have a python app that uses several services from aws. I have one access key and secret for each service. For most of the services I use boto and don't need AWS_ACCESS_KEY_ID or AWS_SECRET_ACCESS_KEY in the environment. For dynamoDB I use pynamoDB and I have no idea how to set the credentials without these variables.</p>
  
  <p>I want to standardize the credential in a settings file to avoid errors like clash of credentials. </p>
  
  <p>Is this possible? If so, how is it done?</p>