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Diffstat (limited to 'lib/python2.7/test/double_const.py')
| -rw-r--r-- | lib/python2.7/test/double_const.py | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/lib/python2.7/test/double_const.py b/lib/python2.7/test/double_const.py deleted file mode 100644 index 16c33a1..0000000 --- a/lib/python2.7/test/double_const.py +++ /dev/null @@ -1,30 +0,0 @@ -from test.test_support import TestFailed - -# A test for SF bug 422177: manifest float constants varied way too much in -# precision depending on whether Python was loading a module for the first -# time, or reloading it from a precompiled .pyc. The "expected" failure -# mode is that when test_import imports this after all .pyc files have been -# erased, it passes, but when test_import imports this from -# double_const.pyc, it fails. This indicates a woeful loss of precision in -# the marshal format for doubles. It's also possible that repr() doesn't -# produce enough digits to get reasonable precision for this box. - -PI = 3.14159265358979324 -TWOPI = 6.28318530717958648 - -PI_str = "3.14159265358979324" -TWOPI_str = "6.28318530717958648" - -# Verify that the double x is within a few bits of eval(x_str). -def check_ok(x, x_str): - assert x > 0.0 - x2 = eval(x_str) - assert x2 > 0.0 - diff = abs(x - x2) - # If diff is no larger than 3 ULP (wrt x2), then diff/8 is no larger - # than 0.375 ULP, so adding diff/8 to x2 should have no effect. - if x2 + (diff / 8.) != x2: - raise TestFailed("Manifest const %s lost too much precision " % x_str) - -check_ok(PI, PI_str) -check_ok(TWOPI, TWOPI_str) |