code: def upload_entities(namespace, workspace, entity_data):
      
      body = urlencode({"entities" : entity_data})
      headers = _fiss_agent_header({
          'Content-type':  "application/x-www-form-urlencoded"
      })
      uri = "workspaces/{0}/{1}/importEntities".format(namespace, workspace)
      return __post(uri, headers=headers, data=body)
docs: Upload entities from tab-delimited string.
  
      Args:
          namespace (str): project to which workspace belongs
          workspace (str): Workspace name
          entity_data (str): TSV string describing entites
  
      Swagger:
          https://api.firecloud.org/#!/Entities/importEntities