code: def _convert(cls, name, module, filter, source=None):
      
      # convert all constants from source (or module) that pass filter() to
      # a new Enum called name, and export the enum and its members back to
      # module;
      # also, replace the __reduce_ex__ method so unpickling works in
      # previous Python versions
      module_globals = vars(_sys.modules[module])
      if source:
          source = vars(source)
      else:
          source = module_globals
      members = dict((name, value) for name, value in source.items() if filter(name))
      cls = cls(name, members, module=module)
      cls.__reduce_ex__ = _reduce_ex_by_name
      module_globals.update(cls.__members__)
      module_globals[name] = cls
      return cls
docs: Create a new Enum subclass that replaces a collection of global constants