def _set_snps(self, snps, build=37):
        """ Set `_snps` and `_build` properties of this ``Individual``.

        Notes
        -----
        Intended to be used internally to `lineage`.

        Parameters
        ----------
        snps : pandas.DataFrame
            individual's genetic data normalized for use with `lineage`
        build : int
            build of this ``Individual``'s SNPs
        """
        self._snps = snps
        self._build = build
Set `_snps` and `_build` properties of this ``Individual``.

        Notes
        -----
        Intended to be used internally to `lineage`.

        Parameters
        ----------
        snps : pandas.DataFrame
            individual's genetic data normalized for use with `lineage`
        build : int
            build of this ``Individual``'s SNPs