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annotate Lib/test/double_const.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 226ba34bd998
children 9c930a32cebb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
24442
226ba34bd998 Complete the absolute import patch for the test suite. All relative
Barry Warsaw <barry@python.org>
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1 from test.test_support import TestFailed
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2
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3 # A test for SF bug 422177: manifest float constants varied way too much in
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4 # precision depending on whether Python was loading a module for the first
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5 # time, or reloading it from a precompiled .pyc. The "expected" failure
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6 # mode is that when test_import imports this after all .pyc files have been
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7 # erased, it passes, but when test_import imports this from
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8 # double_const.pyc, it fails. This indicates a woeful loss of precision in
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9 # the marshal format for doubles. It's also possible that repr() doesn't
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10 # produce enough digits to get reasonable precision for this box.
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11
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12 PI = 3.14159265358979324
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13 TWOPI = 6.28318530717958648
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14
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15 PI_str = "3.14159265358979324"
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16 TWOPI_str = "6.28318530717958648"
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17
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18 # Verify that the double x is within a few bits of eval(x_str).
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19 def check_ok(x, x_str):
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20 assert x > 0.0
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21 x2 = eval(x_str)
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22 assert x2 > 0.0
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23 diff = abs(x - x2)
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24 # If diff is no larger than 3 ULP (wrt x2), then diff/8 is no larger
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25 # than 0.375 ULP, so adding diff/8 to x2 should have no effect.
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26 if x2 + (diff / 8.) != x2:
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27 raise TestFailed("Manifest const %s lost too much precision " % x_str)
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28
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29 check_ok(PI, PI_str)
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30 check_ok(TWOPI, TWOPI_str)