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Add Py_GetConstant() and Py_GetConstantBorrowed() functions. In the limited C API version 3.13, getting Py_None, Py_False, Py_True, Py_Ellipsis and Py_NotImplemented singletons is now implemented as function calls at the stable ABI level to hide implementation details. Getting these constants still return borrowed references. Add _testlimitedcapi/object.c and test_capi/test_object.py to test Py_GetConstant() and Py_GetConstantBorrowed() functions.
54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
import enum
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import unittest
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from test.support import import_helper
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_testlimitedcapi = import_helper.import_module('_testlimitedcapi')
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class Constant(enum.IntEnum):
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Py_CONSTANT_NONE = 0
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Py_CONSTANT_FALSE = 1
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Py_CONSTANT_TRUE = 2
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Py_CONSTANT_ELLIPSIS = 3
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Py_CONSTANT_NOT_IMPLEMENTED = 4
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Py_CONSTANT_ZERO = 5
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Py_CONSTANT_ONE = 6
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Py_CONSTANT_EMPTY_STR = 7
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Py_CONSTANT_EMPTY_BYTES = 8
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Py_CONSTANT_EMPTY_TUPLE = 9
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INVALID_CONSTANT = Py_CONSTANT_EMPTY_TUPLE + 1
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class CAPITest(unittest.TestCase):
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def check_get_constant(self, get_constant):
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self.assertIs(get_constant(Constant.Py_CONSTANT_NONE), None)
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self.assertIs(get_constant(Constant.Py_CONSTANT_FALSE), False)
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self.assertIs(get_constant(Constant.Py_CONSTANT_TRUE), True)
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self.assertIs(get_constant(Constant.Py_CONSTANT_ELLIPSIS), Ellipsis)
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self.assertIs(get_constant(Constant.Py_CONSTANT_NOT_IMPLEMENTED), NotImplemented)
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for constant_id, constant_type, value in (
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(Constant.Py_CONSTANT_ZERO, int, 0),
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(Constant.Py_CONSTANT_ONE, int, 1),
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(Constant.Py_CONSTANT_EMPTY_STR, str, ""),
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(Constant.Py_CONSTANT_EMPTY_BYTES, bytes, b""),
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(Constant.Py_CONSTANT_EMPTY_TUPLE, tuple, ()),
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):
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with self.subTest(constant_id=constant_id):
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obj = get_constant(constant_id)
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self.assertEqual(type(obj), constant_type, obj)
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self.assertEqual(obj, value)
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with self.assertRaises(SystemError):
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get_constant(Constant.INVALID_CONSTANT)
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def test_get_constant(self):
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self.check_get_constant(_testlimitedcapi.get_constant)
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def test_get_constant_borrowed(self):
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self.check_get_constant(_testlimitedcapi.get_constant_borrowed)
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if __name__ == "__main__":
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unittest.main()
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