Class uname_result

Lib/platform.py:876–917

A uname_result that's largely compatible with a simple namedtuple except that 'processor' is resolved late and cached to avoid calling "uname" except when needed.

### Portable uname() interface

class uname_result(
    collections.namedtuple(
        "uname_result_base",
        "system node release version machine")
        ):
    """
    A uname_result that's largely compatible with a
    simple namedtuple except that 'processor' is
    resolved late and cached to avoid calling "uname"
    except when needed.
    """

    _fields = ('system', 'node', 'release', 'version', 'machine', 'processor')

    @functools.cached_property
    def processor(self):
        return _unknown_as_blank(_Processor.get())

    def __iter__(self):
        return itertools.chain(
            super().__iter__(),
            (self.processor,)
        )

    @classmethod
    def _make(cls, iterable):
        # override factory to affect length check
        num_fields = len(cls._fields) - 1
        result = cls.__new__(cls, *iterable)
        if len(result) != num_fields + 1:
            msg = f'Expected {num_fields} arguments, got {len(result)}'
            raise TypeError(msg)
        return result

    def __getitem__(self, key):
        return tuple(self)[key]

    def __len__(self):
        return len(tuple(iter(self)))

    def __reduce__(self):
        return uname_result, tuple(self)[:len(self._fields) - 1]


_uname_cache = None