title: How to access Google Datastore API with credentials without using environment variables?
body: <p>Currently I'm getting access to the API though the GOOGLE_APPLICATION_CREDENTIALS environment variable. I created and downloaded a service account key as a .json file and set the environment variable to that file. Due to the requirements of the project I'm working on, I won't be able to do this. I tried using the credentials variable in the constructor for the datastore client object, but I wasn't able to get that to work. How should I be going about this?</p>
  
  <p>I'm running Windows 10, but any solution should be (relatively) OS agnostic. I'm writing in python 3.6.</p>