code: def get_variant_genotypes(self, variant):
          
          # Find the variant in the bim.
          try:
              plink_chrom = CHROM_STR_TO_INT[variant.chrom.name]
          except KeyError:
              raise ValueError(
                  "Invalid chromosome ('{}') for Plink.".format(variant.chrom)
              )
  
          info = self.bim.loc[
              (self.bim.chrom == plink_chrom) &
              (self.bim.pos == variant.pos), :
          ]
  
          if info.shape[0] == 0:
              logging.variant_not_found(variant)
              return []
  
          elif info.shape[0] == 1:
              return self._get_biallelic_variant(variant, info)
  
          else:
              return self._get_multialleic_variant(variant, info)
docs: Get the genotypes from a well formed variant instance.
  
          Args:
              marker (Variant): A Variant instance.
  
          Returns:
              A list of Genotypes instance containing a pointer to the variant as
              well as a vector of encoded genotypes.
  
          Note
          ====
              If the sample IDs are not unique, the index is changed to be the
              sample family ID and individual ID (i.e. fid_iid).