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Issue #27006: from_float(): call the subclass' __new__() and __init__().

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This commit is contained in:
Stefan Krah 2016-06-20 12:10:13 +02:00
parent 2275e626b1
commit 6817c59cf0
2 changed files with 12 additions and 3 deletions
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5
Lib/test/test_decimal.py
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@ -2491,7 +2491,8 @@ class PythonAPItests(unittest.TestCase):
Decimal = self.decimal.Decimal
class MyDecimal(Decimal):
pass
def __init__(self, _):
self.x = 'y'
self.assertTrue(issubclass(MyDecimal, Decimal))
@ -2499,6 +2500,8 @@ class PythonAPItests(unittest.TestCase):
self.assertEqual(type(r), MyDecimal)
self.assertEqual(str(r),
'0.1000000000000000055511151231257827021181583404541015625')
self.assertEqual(r.x, 'y')
bigint = 12345678901234567890123456789
self.assertEqual(MyDecimal.from_float(bigint), MyDecimal(bigint))
self.assertTrue(MyDecimal.from_float(float('nan')).is_qnan())

10
Modules/_decimal/_decimal.c
View file

@ -2630,12 +2630,18 @@ PyDecType_FromSequenceExact(PyTypeObject *type, PyObject *v,
/* class method */
static PyObject *
dec_from_float(PyObject *dec, PyObject *pyfloat)
dec_from_float(PyObject *type, PyObject *pyfloat)
{
PyObject *context;
PyObject *result;
CURRENT_CONTEXT(context);
return PyDecType_FromFloatExact((PyTypeObject *)dec, pyfloat, context);
result = PyDecType_FromFloatExact(&PyDec_Type, pyfloat, context);
if (!PyDec_CheckExact(type) && result != NULL) {
Py_SETREF(result, PyObject_CallFunctionObjArgs(type, result, NULL));
}
return result;
}
/* create_decimal_from_float */