code: def init_genotype_file(self):
          
          self.genotype_file.seek(0)
  
          buff = self.genotype_file.read(3)
          version = 0
          magic, data_format = buff.unpack("HB", version)
          return magic, data_format
docs: Resets the bed file and preps it for starting at the start of the \
              genotype data
  
          Returns to beginning of file and reads the version so that it points \
          to first marker's info
  
          :return: None