def gene_names(self, contig=None, strand=None):
        """
        Return all genes in the database,
        optionally restrict to a chromosome and/or strand.
        """
        return self._all_feature_values(
            column="gene_name",
            feature="gene",
            contig=contig,
            strand=strand)
def gene_names ( self , contig = None , strand = None ) : return self . _all_feature_values ( column = "gene_name" , feature = "gene" , contig = contig , strand = strand )
Return all genes in the database,
        optionally restrict to a chromosome and/or strand.