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bpo-45167: Fix deepcopying of GenericAlias (GH-28324)

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Serhiy Storchaka 2021-09-15 21:25:41 +03:00 committed by GitHub
parent 84a6061e29
commit 5dce51a887
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3 changed files with 28 additions and 5 deletions
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30
Lib/test/test_genericalias.py
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@ -2,6 +2,7 @@
import unittest
import pickle
import copy
from collections import (
defaultdict, deque, OrderedDict, Counter, UserDict, UserList
)
@ -270,11 +271,30 @@ class BaseTest(unittest.TestCase):
def test_pickle(self):
alias = GenericAlias(list, T)
s = pickle.dumps(alias)
loaded = pickle.loads(s)
self.assertEqual(alias.__origin__, loaded.__origin__)
self.assertEqual(alias.__args__, loaded.__args__)
self.assertEqual(alias.__parameters__, loaded.__parameters__)
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
s = pickle.dumps(alias, proto)
loaded = pickle.loads(s)
self.assertEqual(loaded.__origin__, alias.__origin__)
self.assertEqual(loaded.__args__, alias.__args__)
self.assertEqual(loaded.__parameters__, alias.__parameters__)
def test_copy(self):
class X(list):
def __copy__(self):
return self
def __deepcopy__(self, memo):
return self
for origin in list, deque, X:
alias = GenericAlias(origin, T)
copied = copy.copy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)
copied = copy.deepcopy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)
def test_union(self):
a = typing.Union[list[int], list[str]]

1
Misc/NEWS.d/next/Core and Builtins/2021-09-14-09-23-59.bpo-45167.CPSSoV.rst Normal file
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@ -0,0 +1 @@
Fix deepcopying of :class:`types.GenericAlias` objects.

2
Objects/genericaliasobject.c
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@ -418,6 +418,8 @@ static const char* const attr_exceptions[] = {
"__mro_entries__",
"__reduce_ex__", // needed so we don't look up object.__reduce_ex__
"__reduce__",
"__copy__",
"__deepcopy__",
NULL,
};