code: def filter_genes(self, gene_names : Iterable[str], inplace=False):
          
  
          return self.drop(set(self.genes) - set(gene_names),
                           inplace=inplace)
docs: Filter the expression matrix against a _genome (set of genes).
  
          Parameters
          ----------
          gene_names: list of str
              The genome to filter the genes against.
          inplace: bool, optional
              Whether to perform the operation in-place.
  
          Returns
          -------
          ExpMatrix
              The filtered expression matrix.