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SF bug 115831 and Ping's SF patch 101751, 0.0**-2.0 returns inf rather than

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raise ValueError.  Checked in the patch as far as it went, but also changed
all of ints, longs and floats to raise ZeroDivisionError instead when raising
0 to a negative number.  This is what 754-inspired stds require, as the "true
result" is an infinity obtained from finite operands, i.e. it's a singularity.
Also changed float pow to not be so timid about using its square-and-multiply
algorithm.  Note that what math.pow does is unrelated to what builtin pow
does, and will still vary by platform.
This commit is contained in:
Tim Peters 2000-10-06 00:36:09 +00:00
parent 4779a0a6fd
commit c54d19043a
4 changed files with 102 additions and 62 deletions
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8
Objects/longobject.c
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@ -1244,8 +1244,12 @@ long_pow(PyLongObject *a, PyLongObject *b, PyLongObject *c)
size_b = b->ob_size;
if (size_b < 0) {
PyErr_SetString(PyExc_ValueError,
"long integer to the negative power");
if (a->ob_size)
PyErr_SetString(PyExc_ValueError,
"long integer to a negative power");
else
PyErr_SetString(PyExc_ZeroDivisionError,
"zero to a negative power");
return NULL;
}
z = (PyLongObject *)PyLong_FromLong(1L);