我们从Python开源项目中，提取了以下13个代码示例，用于说明如何使用sys.float_info()。
def test_float_roundtrip(self): info = sys.float_info inf = float("inf") nan = float("nan") self.assertEqual(1.0, serialize.load(serialize.dump(1.0))) self.assertEqual(-1.0, serialize.load(serialize.dump(-1.0))) self.assertEqual(info.min, serialize.load(serialize.dump(info.min))) self.assertEqual(info.max, serialize.load(serialize.dump(info.max))) self.assertEqual(inf, serialize.load(serialize.dump(inf))) self.assertEqual(-inf, serialize.load(serialize.dump(-inf))) self.assertTrue(math.isnan(serialize.load(serialize.dump(nan))))
def rank(self): ws = defaultdict(float) outSum = defaultdict(float) wsdef = 1.0 / (len(self.graph) or 1.0) for n, out in self.graph.items(): ws[n] = wsdef outSum[n] = sum((e[2] for e in out), 0.0) # this line for build stable iteration sorted_keys = sorted(self.graph.keys()) for x in xrange(10): # 10 iters for n in sorted_keys: s = 0 for e in self.graph[n]: s += e[2] / outSum[e[1]] * ws[e[1]] ws[n] = (1 - self.d) + self.d * s (min_rank, max_rank) = (sys.float_info[0], sys.float_info[3]) for w in itervalues(ws): if w < min_rank: min_rank = w if w > max_rank: max_rank = w for n, w in ws.items(): # to unify the weights, don't *100. ws[n] = (w - min_rank / 10.0) / (max_rank - min_rank / 10.0) return ws
def rank(self): ws = collections.defaultdict(float) outSum = collections.defaultdict(float) wsdef = 1.0 / (len(self.graph) or 1.0) for n, out in self.graph.items(): ws[n] = wsdef outSum[n] = sum((e[1] for e in out), 0.0) # this line for build stable iteration sorted_keys = sorted(self.graph.keys()) for x in range(10): # 10 iters for n in sorted_keys: s = 0 for e in self.graph[n]: if outSum[e[0]] and ws[e[0]]: s += e[1] / outSum[e[0]] * ws[e[0]] ws[n] = (1 - self.d) + self.d * s (min_rank, max_rank) = (sys.float_info[0], sys.float_info[3]) for w in ws.values(): if w < min_rank: min_rank = w elif w > max_rank: max_rank = w for n, w in ws.items(): # to unify the weights, don't *100. ws[n] = (w - min_rank / 10.0) / (max_rank - min_rank / 10.0) return ws
def test_attributes(self): self.assertIsInstance(sys.api_version, int) self.assertIsInstance(sys.argv, list) self.assertIn(sys.byteorder, ("little", "big")) self.assertIsInstance(sys.builtin_module_names, tuple) self.assertIsInstance(sys.copyright, basestring) self.assertIsInstance(sys.exec_prefix, basestring) self.assertIsInstance(sys.executable, basestring) self.assertEqual(len(sys.float_info), 11) self.assertEqual(sys.float_info.radix, 2) self.assertEqual(len(sys.long_info), 2) self.assertTrue(sys.long_info.bits_per_digit % 5 == 0) self.assertTrue(sys.long_info.sizeof_digit >= 1) self.assertEqual(type(sys.long_info.bits_per_digit), int) self.assertEqual(type(sys.long_info.sizeof_digit), int) self.assertIsInstance(sys.hexversion, int) self.assertIsInstance(sys.maxint, int) if test.test_support.have_unicode: self.assertIsInstance(sys.maxunicode, int) self.assertIsInstance(sys.platform, basestring) self.assertIsInstance(sys.prefix, basestring) self.assertIsInstance(sys.version, basestring) vi = sys.version_info self.assertIsInstance(vi[:], tuple) self.assertEqual(len(vi), 5) self.assertIsInstance(vi[0], int) self.assertIsInstance(vi[1], int) self.assertIsInstance(vi[2], int) self.assertIn(vi[3], ("alpha", "beta", "candidate", "final")) self.assertIsInstance(vi[4], int) self.assertIsInstance(vi.major, int) self.assertIsInstance(vi.minor, int) self.assertIsInstance(vi.micro, int) self.assertIn(vi.releaselevel, ("alpha", "beta", "candidate", "final")) self.assertIsInstance(vi.serial, int) self.assertEqual(vi[0], vi.major) self.assertEqual(vi[1], vi.minor) self.assertEqual(vi[2], vi.micro) self.assertEqual(vi[3], vi.releaselevel) self.assertEqual(vi[4], vi.serial) self.assertTrue(vi > (1,0,0)) self.assertIsInstance(sys.float_repr_style, str) self.assertIn(sys.float_repr_style, ('short', 'legacy'))
def test_attributes(self): self.assertIsInstance(sys.api_version, int) self.assertIsInstance(sys.argv, list) self.assertIn(sys.byteorder, ("little", "big")) self.assertIsInstance(sys.builtin_module_names, tuple) self.assertIsInstance(sys.copyright, basestring) self.assertIsInstance(sys.exec_prefix, basestring) self.assertIsInstance(sys.executable, basestring) self.assertEqual(len(sys.float_info), 11) self.assertEqual(sys.float_info.radix, 2) self.assertEqual(len(sys.long_info), 2) if test.test_support.check_impl_detail(cpython=True): self.assertTrue(sys.long_info.bits_per_digit % 5 == 0) else: self.assertTrue(sys.long_info.bits_per_digit >= 1) self.assertTrue(sys.long_info.sizeof_digit >= 1) self.assertEqual(type(sys.long_info.bits_per_digit), int) self.assertEqual(type(sys.long_info.sizeof_digit), int) self.assertIsInstance(sys.hexversion, int) self.assertIsInstance(sys.maxint, int) if test.test_support.have_unicode: self.assertIsInstance(sys.maxunicode, int) self.assertIsInstance(sys.platform, basestring) self.assertIsInstance(sys.prefix, basestring) self.assertIsInstance(sys.version, basestring) vi = sys.version_info self.assertIsInstance(vi[:], tuple) self.assertEqual(len(vi), 5) self.assertIsInstance(vi[0], int) self.assertIsInstance(vi[1], int) self.assertIsInstance(vi[2], int) self.assertIn(vi[3], ("alpha", "beta", "candidate", "final")) self.assertIsInstance(vi[4], int) self.assertIsInstance(vi.major, int) self.assertIsInstance(vi.minor, int) self.assertIsInstance(vi.micro, int) self.assertIn(vi.releaselevel, ("alpha", "beta", "candidate", "final")) self.assertIsInstance(vi.serial, int) self.assertEqual(vi[0], vi.major) self.assertEqual(vi[1], vi.minor) self.assertEqual(vi[2], vi.micro) self.assertEqual(vi[3], vi.releaselevel) self.assertEqual(vi[4], vi.serial) self.assertTrue(vi > (1,0,0)) self.assertIsInstance(sys.float_repr_style, str) self.assertIn(sys.float_repr_style, ('short', 'legacy'))
