pcg32bounded argument check about fastrand HOT 8 CLOSED

python -m timeit -s 'import fastrand' 'fastrand.pcg32bounded(1001)'
10000000 loops, best of 3: 0.0924 usec per loop

python -m timeit -s 'import fastrand' 'fastrand.pcg32bounded(1001)'
10000000 loops, best of 3: 0.0602 usec per loop

Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> from fastrand import *        # PyLong_AsUnsignedLong PATCH
>>> print pcg32bounded(0)         # should not return anything
0
>>> pcg32bounded(-1)              # error message mysteriously delayed
41705474
>>>
OverflowError: can't convert negative value to unsigned long
>>>
>>> pcg32bounded('hi')            # Python 2 SystemError bug ?
-888685582
>>>
SystemError: ..\Objects\longobject.c:336: bad argument to internal function
>>>

Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 16:07:46) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from fastrand import *
>>> print(pcg32bounded(1001))
82
>>> print(pcg32bounded(0))
None
>>> print(pcg32bounded(2**31-1), pcg32bounded(-2**31))
20852737 None
>>> print(pcg32bounded(2**31))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OverflowError: Python int too large to convert to C long
>>>
>>> print(pcg32bounded('Hi'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: an integer is required (got type str)

$ python3
Python 3.5.2 (default, Nov 17 2016, 17:05:23)
Type "help", "copyright", "credits" or "license" for more information.
>>> import fastrand
>>> fastrand.pcg32bounded(-1)
>>> fastrand.pcg32bounded(0)

>>> import fastrand
>>> fastrand.pcg32bounded(-1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: no such random number exist
>>>
>>> fastrand.pcg32bounded(0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: no such random number exist
>>>

#if PY_MAJOR_VERSION >= 3
#define PyInt_AsLong(x)   PyLong_AsLong(x)
#endif

static PyObject*
pcg32bounded(PyObject* self, PyObject* args)
{
    int n = PyInt_AsLong(args);
    if (n > 0)
      return Py_BuildValue("i", pcg32_random_bounded_divisionless(n));
    if (!PyErr_Occurred())
      PyErr_SetString(PyExc_ValueError, "no such random number exist");
    return NULL;
}

>>> gmpy2.invert(101, 12345)
mpz(9656)
>>>
>>> gmpy2.invert(105, 12345)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ZeroDivisionError: invert() no inverse exists