code: def load_core_file(core_fp):
      
      core = {}
      with open(core_fp) as in_f:
          for line in in_f.read().splitlines():
              if not line.startswith("#"):
                  otu_id, tax = line.split("\t")
                  core[otu_id] = oc.otu_name(ast.literal_eval(tax))
      return core
docs: For core OTU data file, returns Genus-species identifier for each data
      entry.
      :type core_fp: str
      :param core_fp: A file containing core OTU data.
      :rtype: str
      :return: Returns genus-species identifier based on identified taxonomical
               level.