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bpo-42163, bpo-42189, bpo-42659: Support uname_tuple._replace (for all but processor) (#23010)

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* Add test capturing missed expectation with uname_result._replace.

* bpo-42163: Override uname_result._make to allow uname_result._replace to work (for everything but 'processor'.

* Replace hard-coded length with one derived from the definition.

* Add test capturing missed expectation with copy/deepcopy on namedtuple (bpo-42189).

* bpo-42189: Exclude processor parameter when constructing uname_result.

* In _make, rely on __new__ to strip processor.

* Add blurb.

* iter is not necessary here.

* Rely on num_fields in __new__

* Add test for slices on uname

* Add test for copy and pickle.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

* import pickle

* Fix equality test after pickling.

* Simply rely on __reduce__ for pickling.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Jason R. Coombs 2020-12-31 14:08:03 -05:00 • committed by GitHub
parent dfdca85dfa
commit a6fd0f414c
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3 changed files with 50 additions and 2 deletions
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17
Lib/platform.py
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@ -769,7 +769,7 @@ class uname_result(
):
"""
A uname_result that's largely compatible with a
simple namedtuple except that 'platform' is
simple namedtuple except that 'processor' is
resolved late and cached to avoid calling "uname"
except when needed.
"""
@ -784,12 +784,25 @@ class uname_result(
(self.processor,)
)
@classmethod
def _make(cls, iterable):
# override factory to affect length check
num_fields = len(cls._fields)
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(iter(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)]
_uname_cache = None