code: def RattributesBM(dataset,database,host=rbiomart_host):
      
      biomaRt = importr("biomaRt")
      ensemblMart=biomaRt.useMart(database, host=rbiomart_host)
      ensembl=biomaRt.useDataset(dataset, mart=ensemblMart)
      print(biomaRt.listAttributes(ensembl))
docs: Lists BioMart attributes through a RPY2 connection.
  
      :param dataset: a dataset listed in RdatasetsBM()
      :param database: a database listed in RdatabasesBM()
      :param host: address of the host server, default='www.ensembl.org'
  
      :returns: nothing