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Raise OverflowError when appropriate on long->float conversion. Most of

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the fiddling is simply due to that no caller of PyLong_AsDouble ever
checked for failure (so that's fixing old bugs).  PyLong_AsDouble is much
faster for big inputs now too, but that's more of a happy consequence
than a design goal.
This commit is contained in:
Tim Peters 2001-09-04 05:14:19 +00:00
parent 1832de4bc0
commit 9fffa3eea3
5 changed files with 76 additions and 23 deletions
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37
Lib/test/test_long.py
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@ -328,6 +328,42 @@ def test_auto_overflow():
raise TestFailed("pow%r should have raised "
"TypeError" % ((longx, longy, long(z))))
# ---------------------------------------- tests of long->float overflow
def test_float_overflow():
import math
if verbose:
print "long->float overflow"
for x in -2.0, -1.0, 0.0, 1.0, 2.0:
verify(float(long(x)) == x)
huge = 1L << 30000
mhuge = -huge
namespace = {'huge': huge, 'mhuge': mhuge, 'math': math}
for test in ["float(huge)", "float(mhuge)",
"complex(huge)", "complex(mhuge)",
"complex(huge, 1)", "complex(mhuge, 1)",
"complex(1, huge)", "complex(1, mhuge)",
"1. + huge", "huge + 1.", "1. + mhuge", "mhuge + 1.",
"1. - huge", "huge - 1.", "1. - mhuge", "mhuge - 1.",
"1. * huge", "huge * 1.", "1. * mhuge", "mhuge * 1.",
"1. // huge", "huge // 1.", "1. // mhuge", "mhuge // 1.",
"1. / huge", "huge / 1.", "1. / mhuge", "mhuge / 1.",
"1. ** huge", "huge ** 1.", "1. ** mhuge", "mhuge ** 1.",
"math.sin(huge)", "math.sin(mhuge)",
"math.log(huge)", "math.log(mhuge)", # should do better
"math.sqrt(huge)", "math.sqrt(mhuge)", # should do better
"math.log10(huge)", "math.log10(mhuge)", # should do better
"math.floor(huge)", "math.floor(mhuge)"]:
try:
eval(test, namespace)
except OverflowError:
pass
else:
raise TestFailed("expected OverflowError from %s" % test)
# ---------------------------------------------------------------- do it
test_division()
@ -335,3 +371,4 @@ test_bitop_identities()
test_format()
test_misc()
test_auto_overflow()
test_float_overflow()