Lists BioMart datasets through a RPY2 connection.

    :param database: a database listed in RdatabasesBM()
    :param host: address of the host server, default='www.ensembl.org'

    :returns: nothing

def RdatasetsBM(database,host=rbiomart_host):
    """
    Lists BioMart datasets through a RPY2 connection.

    :param database: a database listed in RdatabasesBM()
    :param host: address of the host server, default='www.ensembl.org'

    :returns: nothing

    """
    biomaRt = importr("biomaRt")
    ensemblMart=biomaRt.useMart(database, host=host)
    print(biomaRt.listDatasets(ensemblMart))