class MersenneTwister_TestBasicOps(TestBasicOps):

gen = random.Random()

@test_support.cpython_only

def test_bug_31478(self):

# _random.Random.seed() should ignore the __abs__() method of a

# long/int subclass argument.

class BadInt(int):

def __abs__(self):

1/0

class BadLong(long):

def __abs__(self):

1/0

self.gen.seed(42)

expected_value = self.gen.random()

for seed_arg in [42L, BadInt(42), BadLong(42)]:

self.gen.seed(seed_arg)

self.assertEqual(self.gen.random(), expected_value)

def test_setstate_first_arg(self):

self.assertRaises(ValueError, self.gen.setstate, (1, None, None))

Prevent unwanted behavior in `_random.Random.seed()` in case the argument

has a bad ``__abs__()`` method. Patch by Oren Milman.

}

/* If the arg is an int or long, use its absolute value; else use

* the absolute value of its hash code.

* Calling int.__abs__() or long.__abs__() prevents calling arg.__abs__(),

* which might return an invalid value. See issue #31478.

*/

if (PyInt_Check(arg) || PyLong_Check(arg))

n = PyNumber_Absolute(arg);

if (PyInt_Check(arg)) {

n = PyInt_Type.tp_as_number->nb_absolute(arg);

}

else if (PyLong_Check(arg)) {

n = PyLong_Type.tp_as_number->nb_absolute(arg);

}

else {

long hash = PyObject_Hash(arg);

if (hash == -1)