How to use the vivisect.const.EXP_UNTYPED function in vivisect

if utils.is_legit_pe(bytes):
                    pe = utils.get_pe_obj(va)
                if not entry_point and pe:
                    entry_point = pe.IMAGE_NT_HEADERS.OptionalHeader.AddressOfEntryPoint + va
                if entry_point:
                    self.vw.addEntryPoint(entry_point)
                    self.vw.addExport(entry_point, vivisect.const.EXP_FUNCTION, '__entry', '')
                if pe:
                    self.vw.addVaSet("Library Loads",
                                     (("Address", vivisect.const.VASET_ADDRESS), ("Library", vivisect.const.VASET_STRING)))
                    self.vw.addVaSet('pe:ordinals',
                                     (('Address', vivisect.const.VASET_ADDRESS), ('Ordinal', vivisect.const.VASET_INTEGER)))
                    # Add exports
                    for rva, _, expname in pe.getExports():
                        self.vw.addExport(
                            va + rva, vivisect.const.EXP_UNTYPED, expname, '')
                    # Add imports
                    for rva, lname, iname in pe.getImports():
                        if self.vw.probeMemory(rva + va, 4, envi.memory.MM_READ):
                            self.vw.makeImport(rva + va, lname, iname)

                self.vw._snapInAnalysisModules()

            # save the analysis
            self.vw.setMeta("StorageModule", "vivisect.storage.basicfile")
            self.vw.setMeta("StorageName", storage_fname)

            self.vw.analyze()
            self.vw.saveWorkspace()
        print " [+] vivisect workspace load complete."