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| author | Tim Peters <tim.peters@gmail.com> | 2000-10-06 00:36:09 (GMT) |
|---|---|---|
| committer | Tim Peters <tim.peters@gmail.com> | 2000-10-06 00:36:09 (GMT) |
| commit | c54d19043a595679f253a55e46fda2910f513c52 (patch) | |
| tree | a737fd6e07e1224f22837ac9822f36b5cdb1524d /Objects/longobject.c | |
| parent | 4779a0a6fd444d594f1cbb992c636d66f59a5d1d (diff) | |
| download | cpython-c54d19043a595679f253a55e46fda2910f513c52.zip cpython-c54d19043a595679f253a55e46fda2910f513c52.tar.gz cpython-c54d19043a595679f253a55e46fda2910f513c52.tar.bz2 | |
SF bug 115831 and Ping's SF patch 101751, 0.0**-2.0 returns inf rather than
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.
Diffstat (limited to 'Objects/longobject.c')
| -rw-r--r-- | Objects/longobject.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Objects/longobject.c b/Objects/longobject.c index 65dcaa0..bfb431f 100644 --- a/Objects/longobject.c +++ b/Objects/longobject.c @@ -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); |