code: def get_env_key(obj, key=None):
      
      return str.join('_', [obj.__module__.replace('.','_').upper(),
          key.upper()])
docs: Return environment variable key to use for lookups within a
      namespace represented by the package name.
  
      For example, any varialbes for predix.security.uaa are stored
      as PREDIX_SECURITY_UAA_KEY