code: def file_describe(object_id, input_params={}, always_retry=True, **kwargs):
      
      return DXHTTPRequest('/%s/describe' % object_id, input_params, always_retry=always_retry, **kwargs)
docs: Invokes the /file-xxxx/describe API method.
  
      For more info, see: https://wiki.dnanexus.com/API-Specification-v1.0.0/Files#API-method%3A-%2Ffile-xxxx%2Fdescribe