code: def _process_stock_genotype(self, limit):
          
  
          if self.test_mode:
              graph = self.testgraph
          else:
              graph = self.graph
  
          raw = '/'.join((self.rawdir, 'stock_genotype'))
          LOG.info("processing stock genotype")
          line_counter = 0
  
          with open(raw, 'r') as f:
              filereader = csv.reader(f, delimiter='\t', quotechar='\"')
              f.readline()  # read the header row; skip
              for line in filereader:
                  (stock_genotype_id, stock_id, genotype_id) = line
  
                  stock_key = stock_id
                  stock_id = self.idhash['stock'][stock_key]
                  genotype_key = genotype_id
                  genotype_id = self.idhash['genotype'][genotype_key]
  
                  if self.test_mode \
                          and int(genotype_key) not in self.test_keys['genotype']:
                      continue
  
                  graph.addTriple(stock_id, self.globaltt['has_genotype'], genotype_id)
  
                  line_counter += 1
  
                  if not self.test_mode and limit is not None and line_counter > limit:
                      break
  
          return
docs: The genotypes of the stocks.
  
          :param limit:
          :return: