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Make floating-point exception error messages slightly more verbose: in

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particular, the error message now allows one to distinguish between a
ValueError arising from a singularity (e.g. log(0.)), which would
usually produce +-infinity in non-stop mode, and a ValueError resulting
from an invalid input (e.g. sqrt(-1.)), which would normally produce a
NaN in non-stop mode.
This commit is contained in:
Mark Dickinson 2008-04-30 23:30:57 +00:00
parent 3cbf15f07a
commit a0de26c342
3 changed files with 24 additions and 21 deletions
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16
Lib/test/ieee754.txt
View File

@ -127,31 +127,31 @@ Trigonometric Functions
>>> sin(INF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> sin(NINF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> sin(NAN)
nan
>>> cos(INF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> cos(NINF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> cos(NAN)
nan
>>> tan(INF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> tan(NINF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> tan(NAN)
nan
@ -169,11 +169,11 @@ True
>>> asin(INF), asin(NINF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> acos(INF), acos(NINF)
Traceback (most recent call last):
...
ValueError: math domain error
ValueError: math domain error (invalid argument)
>>> equal(atan(INF), PI/2), equal(atan(NINF), -PI/2)
(True, True)

6
Lib/test/test_math.py
View File

@ -741,9 +741,9 @@ class MathTests(unittest.TestCase):
func = getattr(math, fn)
try:
result = func(ar)
except ValueError:
message = ("Unexpected ValueError in " +
"test %s:%s(%r)\n" % (id, fn, ar))
except ValueError as exc:
message = (("Unexpected ValueError: %s\n " +
"in test %s:%s(%r)\n") % (exc.args[0], id, fn, ar))
self.fail(message)
self.ftest("%s:%s(%r)" % (id, fn, ar), result, er)

23
Modules/mathmodule.c
View File

@ -174,18 +174,21 @@ math_1_to_whatever(PyObject *arg, double (*func) (double),
PyFPE_START_PROTECT("in math_1", return 0);
r = (*func)(x);
PyFPE_END_PROTECT(r);
if (Py_IS_NAN(r)) {
if (!Py_IS_NAN(x))
errno = EDOM;
else
errno = 0;
if (Py_IS_NAN(r) && !Py_IS_NAN(x)) {
PyErr_SetString(PyExc_ValueError,
"math domain error (invalid argument)");
return NULL;
}
else if (Py_IS_INFINITY(r)) {
if (Py_IS_FINITE(x))
errno = can_overflow ? ERANGE : EDOM;
else
errno = 0;
if (Py_IS_INFINITY(r) && Py_IS_FINITE(x)) {
if (can_overflow)
PyErr_SetString(PyExc_OverflowError,
"math range error (overflow)");
else
PyErr_SetString(PyExc_ValueError,
"math domain error (singularity)");
return NULL;
}
/* on most machines, errno should be 0 at this point */
if (errno && is_error(r))
return NULL;
else