cpython/Lib/test/test_strtod.py

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Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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# Tests for the correctly-rounded string -> float conversions
# introduced in Python 2.7 and 3.1.
import random
import unittest
import re
import sys
import test.support
if getattr(sys, 'float_repr_style', '') != 'short':
raise unittest.SkipTest('correctly-rounded string->float conversions '
'not available on this system')
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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# Correctly rounded str -> float in pure Python, for comparison.
strtod_parser = re.compile(r""" # A numeric string consists of:
(?P<sign>[-+])? # an optional sign, followed by
(?=\d|\.\d) # a number with at least one digit
(?P<int>\d*) # having a (possibly empty) integer part
(?:\.(?P<frac>\d*))? # followed by an optional fractional part
(?:E(?P<exp>[-+]?\d+))? # and an optional exponent
\Z
""", re.VERBOSE | re.IGNORECASE).match
# Pure Python version of correctly rounded string->float conversion.
# Avoids any use of floating-point by returning the result as a hex string.
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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def strtod(s, mant_dig=53, min_exp = -1021, max_exp = 1024):
"""Convert a finite decimal string to a hex string representing an
IEEE 754 binary64 float. Return 'inf' or '-inf' on overflow.
This function makes no use of floating-point arithmetic at any
stage."""
# parse string into a pair of integers 'a' and 'b' such that
# abs(decimal value) = a/b, along with a boolean 'negative'.
m = strtod_parser(s)
if m is None:
raise ValueError('invalid numeric string')
fraction = m.group('frac') or ''
intpart = int(m.group('int') + fraction)
exp = int(m.group('exp') or '0') - len(fraction)
negative = m.group('sign') == '-'
a, b = intpart*10**max(exp, 0), 10**max(0, -exp)
# quick return for zeros
if not a:
return '-0x0.0p+0' if negative else '0x0.0p+0'
# compute exponent e for result; may be one too small in the case
# that the rounded value of a/b lies in a different binade from a/b
d = a.bit_length() - b.bit_length()
d += (a >> d if d >= 0 else a << -d) >= b
e = max(d, min_exp) - mant_dig
# approximate a/b by number of the form q * 2**e; adjust e if necessary
a, b = a << max(-e, 0), b << max(e, 0)
q, r = divmod(a, b)
if 2*r > b or 2*r == b and q & 1:
q += 1
if q.bit_length() == mant_dig+1:
q //= 2
e += 1
# double check that (q, e) has the right form
assert q.bit_length() <= mant_dig and e >= min_exp - mant_dig
assert q.bit_length() == mant_dig or e == min_exp - mant_dig
# check for overflow and underflow
if e + q.bit_length() > max_exp:
return '-inf' if negative else 'inf'
if not q:
return '-0x0.0p+0' if negative else '0x0.0p+0'
# for hex representation, shift so # bits after point is a multiple of 4
hexdigs = 1 + (mant_dig-2)//4
shift = 3 - (mant_dig-2)%4
q, e = q << shift, e - shift
return '{}0x{:x}.{:0{}x}p{:+d}'.format(
'-' if negative else '',
q // 16**hexdigs,
q % 16**hexdigs,
hexdigs,
e + 4*hexdigs)
TEST_SIZE = 10
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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class StrtodTests(unittest.TestCase):
def check_strtod(self, s):
"""Compare the result of Python's builtin correctly rounded
string->float conversion (using float) to a pure Python
correctly rounded string->float implementation. Fail if the
two methods give different results."""
try:
fs = float(s)
except OverflowError:
got = '-inf' if s[0] == '-' else 'inf'
except MemoryError:
got = 'memory error'
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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else:
got = fs.hex()
expected = strtod(s)
self.assertEqual(expected, got,
"Incorrectly rounded str->float conversion for {}: "
"expected {}, got {}".format(s, expected, got))
def test_short_halfway_cases(self):
# exact halfway cases with a small number of significant digits
for k in 0, 5, 10, 15, 20:
# upper = smallest integer >= 2**54/5**k
upper = -(-2**54//5**k)
# lower = smallest odd number >= 2**53/5**k
lower = -(-2**53//5**k)
if lower % 2 == 0:
lower += 1
for i in range(TEST_SIZE):
# Select a random odd n in [2**53/5**k,
# 2**54/5**k). Then n * 10**k gives a halfway case
# with small number of significant digits.
n, e = random.randrange(lower, upper, 2), k
# Remove any additional powers of 5.
while n % 5 == 0:
n, e = n // 5, e + 1
assert n % 10 in (1, 3, 7, 9)
# Try numbers of the form n * 2**p2 * 10**e, p2 >= 0,
# until n * 2**p2 has more than 20 significant digits.
digits, exponent = n, e
while digits < 10**20:
s = '{}e{}'.format(digits, exponent)
self.check_strtod(s)
# Same again, but with extra trailing zeros.
s = '{}e{}'.format(digits * 10**40, exponent - 40)
self.check_strtod(s)
digits *= 2
# Try numbers of the form n * 5**p2 * 10**(e - p5), p5
# >= 0, with n * 5**p5 < 10**20.
digits, exponent = n, e
while digits < 10**20:
s = '{}e{}'.format(digits, exponent)
self.check_strtod(s)
# Same again, but with extra trailing zeros.
s = '{}e{}'.format(digits * 10**40, exponent - 40)
self.check_strtod(s)
digits *= 5
exponent -= 1
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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def test_halfway_cases(self):
# test halfway cases for the round-half-to-even rule
for i in range(100 * TEST_SIZE):
# bit pattern for a random finite positive (or +0.0) float
bits = random.randrange(2047*2**52)
# convert bit pattern to a number of the form m * 2**e
e, m = divmod(bits, 2**52)
if e:
m, e = m + 2**52, e - 1
e -= 1074
# add 0.5 ulps
m, e = 2*m + 1, e - 1
# convert to a decimal string
if e >= 0:
digits = m << e
exponent = 0
else:
# m * 2**e = (m * 5**-e) * 10**e
digits = m * 5**-e
exponent = e
s = '{}e{}'.format(digits, exponent)
self.check_strtod(s)
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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def test_boundaries(self):
# boundaries expressed as triples (n, e, u), where
# n*10**e is an approximation to the boundary value and
# u*10**e is 1ulp
boundaries = [
(10000000000000000000, -19, 1110), # a power of 2 boundary (1.0)
(17976931348623159077, 289, 1995), # overflow boundary (2.**1024)
(22250738585072013831, -327, 4941), # normal/subnormal (2.**-1022)
(0, -327, 4941), # zero
]
for n, e, u in boundaries:
for j in range(1000):
digits = n + random.randrange(-3*u, 3*u)
exponent = e
s = '{}e{}'.format(digits, exponent)
self.check_strtod(s)
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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n *= 10
u *= 10
e -= 1
def test_underflow_boundary(self):
# test values close to 2**-1075, the underflow boundary; similar
# to boundary_tests, except that the random error doesn't scale
# with n
for exponent in range(-400, -320):
base = 10**-exponent // 2**1075
for j in range(TEST_SIZE):
digits = base + random.randrange(-1000, 1000)
s = '{}e{}'.format(digits, exponent)
self.check_strtod(s)
def test_bigcomp(self):
for ndigs in 5, 10, 14, 15, 16, 17, 18, 19, 20, 40, 41, 50:
dig10 = 10**ndigs
for i in range(10 * TEST_SIZE):
digits = random.randrange(dig10)
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
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exponent = random.randrange(-400, 400)
s = '{}e{}'.format(digits, exponent)
self.check_strtod(s)
def test_parsing(self):
# make '0' more likely to be chosen than other digits
digits = '000000123456789'
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
2010-01-14 11:37:49 -04:00
signs = ('+', '-', '')
# put together random short valid strings
# \d*[.\d*]?e
for i in range(1000):
for j in range(TEST_SIZE):
s = random.choice(signs)
intpart_len = random.randrange(5)
s += ''.join(random.choice(digits) for _ in range(intpart_len))
if random.choice([True, False]):
s += '.'
fracpart_len = random.randrange(5)
s += ''.join(random.choice(digits)
for _ in range(fracpart_len))
else:
fracpart_len = 0
if random.choice([True, False]):
s += random.choice(['e', 'E'])
s += random.choice(signs)
exponent_len = random.randrange(1, 4)
s += ''.join(random.choice(digits)
for _ in range(exponent_len))
if intpart_len + fracpart_len:
self.check_strtod(s)
else:
try:
float(s)
except ValueError:
pass
else:
assert False, "expected ValueError"
2013-11-26 16:29:06 -04:00
@test.support.bigmemtest(size=test.support._2G+10, memuse=3, dry_run=False)
def test_oversized_digit_strings(self, maxsize):
# Input string whose length doesn't fit in an INT.
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s = "1." + "1" * maxsize
with self.assertRaises(ValueError):
float(s)
del s
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s = "0." + "0" * maxsize + "1"
with self.assertRaises(ValueError):
float(s)
del s
def test_large_exponents(self):
# Verify that the clipping of the exponent in strtod doesn't affect the
# output values.
def positive_exp(n):
""" Long string with value 1.0 and exponent n"""
return '0.{}1e+{}'.format('0'*(n-1), n)
def negative_exp(n):
""" Long string with value 1.0 and exponent -n"""
return '1{}e-{}'.format('0'*n, n)
self.assertEqual(float(positive_exp(10000)), 1.0)
self.assertEqual(float(positive_exp(20000)), 1.0)
self.assertEqual(float(positive_exp(30000)), 1.0)
self.assertEqual(float(negative_exp(10000)), 1.0)
self.assertEqual(float(negative_exp(20000)), 1.0)
self.assertEqual(float(negative_exp(30000)), 1.0)
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
2010-01-14 11:37:49 -04:00
def test_particular(self):
# inputs that produced crashes or incorrectly rounded results with
# previous versions of dtoa.c, for various reasons
test_strings = [
# issue 7632 bug 1, originally reported failing case
'2183167012312112312312.23538020374420446192e-370',
# 5 instances of issue 7632 bug 2
'12579816049008305546974391768996369464963024663104e-357',
'17489628565202117263145367596028389348922981857013e-357',
'18487398785991994634182916638542680759613590482273e-357',
'32002864200581033134358724675198044527469366773928e-358',
'94393431193180696942841837085033647913224148539854e-358',
'73608278998966969345824653500136787876436005957953e-358',
'64774478836417299491718435234611299336288082136054e-358',
'13704940134126574534878641876947980878824688451169e-357',
'46697445774047060960624497964425416610480524760471e-358',
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
2010-01-14 11:37:49 -04:00
# failing case for bug introduced by METD in r77451 (attempted
# fix for issue 7632, bug 2), and fixed in r77482.
'28639097178261763178489759107321392745108491825303e-311',
# two numbers demonstrating a flaw in the bigcomp 'dig == 0'
# correction block (issue 7632, bug 3)
'1.00000000000000001e44',
'1.0000000000000000100000000000000000000001e44',
# dtoa.c bug for numbers just smaller than a power of 2 (issue
# 7632, bug 4)
'99999999999999994487665465554760717039532578546e-47',
# failing case for off-by-one error introduced by METD in
# r77483 (dtoa.c cleanup), fixed in r77490
'965437176333654931799035513671997118345570045914469' #...
'6213413350821416312194420007991306908470147322020121018368e0',
# incorrect lsb detection for round-half-to-even when
# bc->scale != 0 (issue 7632, bug 6).
'104308485241983990666713401708072175773165034278685' #...
'682646111762292409330928739751702404658197872319129' #...
'036519947435319418387839758990478549477777586673075' #...
'945844895981012024387992135617064532141489278815239' #...
'849108105951619997829153633535314849999674266169258' #...
'928940692239684771590065027025835804863585454872499' #...
'320500023126142553932654370362024104462255244034053' #...
'203998964360882487378334860197725139151265590832887' #...
'433736189468858614521708567646743455601905935595381' #...
'852723723645799866672558576993978025033590728687206' #...
'296379801363024094048327273913079612469982585674824' #...
'156000783167963081616214710691759864332339239688734' #...
'656548790656486646106983450809073750535624894296242' #...
'072010195710276073042036425579852459556183541199012' #...
'652571123898996574563824424330960027873516082763671875e-1075',
# demonstration that original fix for issue 7632 bug 1 was
# buggy; the exit condition was too strong
'247032822920623295e-341',
# demonstrate similar problem to issue 7632 bug1: crash
# with 'oversized quotient in quorem' message.
'99037485700245683102805043437346965248029601286431e-373',
'99617639833743863161109961162881027406769510558457e-373',
'98852915025769345295749278351563179840130565591462e-372',
'99059944827693569659153042769690930905148015876788e-373',
'98914979205069368270421829889078356254059760327101e-372',
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
2010-01-14 11:37:49 -04:00
# issue 7632 bug 5: the following 2 strings convert differently
'1000000000000000000000000000000000000000e-16',
'10000000000000000000000000000000000000000e-17',
# issue 7632 bug 7
'991633793189150720000000000000000000000000000000000000000e-33',
# And another, similar, failing halfway case
'4106250198039490000000000000000000000000000000000000000e-38',
# issue 7632 bug 8: the following produced 10.0
'10.900000000000000012345678912345678912345',
Merged revisions 77484,77487,77561,77570,77593,77603,77608,77667,77702-77703,77739,77858,77887,77889 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77484 | skip.montanaro | 2010-01-13 19:12:34 -0600 (Wed, 13 Jan 2010) | 4 lines Update PyEval_EvalFrame to PyEval_EvalFrameEx. This looks to have been done partially before. Also add a comment describing how this might have to work with different versions of the interpreter. ........ r77487 | ezio.melotti | 2010-01-14 05:34:10 -0600 (Thu, 14 Jan 2010) | 1 line Fixed typo ........ r77561 | georg.brandl | 2010-01-17 02:42:30 -0600 (Sun, 17 Jan 2010) | 1 line #7699: improve datetime docs: straightforward linking to strftime/strptime section, mark classmethods as such. ........ r77570 | georg.brandl | 2010-01-17 06:14:42 -0600 (Sun, 17 Jan 2010) | 1 line Add note about usage of STRINGLIB_EMPTY. ........ r77593 | georg.brandl | 2010-01-17 17:33:53 -0600 (Sun, 17 Jan 2010) | 1 line Fix internal reference. ........ r77603 | benjamin.peterson | 2010-01-18 17:07:56 -0600 (Mon, 18 Jan 2010) | 8 lines data descriptors do not override the class dictionary if __get__ is not defined Adjust documentation and add a test to verify this behavior. See http://mail.python.org/pipermail/python-dev/2010-January/095637.html for discussion. ........ r77608 | gregory.p.smith | 2010-01-19 02:19:03 -0600 (Tue, 19 Jan 2010) | 6 lines Do not compile stubs for the sha2 series hashes in the openssl hashlib module when the openssl version is too old to support them. That leads both compiled code bloat and to unittests attempting to test implementations that don't exist for comparison purposes on such platforms. ........ r77667 | mark.dickinson | 2010-01-21 12:32:27 -0600 (Thu, 21 Jan 2010) | 1 line Add two more test_strtod test values. ........ r77702 | georg.brandl | 2010-01-23 02:43:31 -0600 (Sat, 23 Jan 2010) | 1 line #7762: fix refcount annotation of PyUnicode_Tailmatch(). ........ r77703 | georg.brandl | 2010-01-23 02:47:54 -0600 (Sat, 23 Jan 2010) | 1 line #7725: fix referencing issue. ........ r77739 | benjamin.peterson | 2010-01-24 21:52:52 -0600 (Sun, 24 Jan 2010) | 1 line mention from_float() in error message ........ r77858 | georg.brandl | 2010-01-30 11:57:48 -0600 (Sat, 30 Jan 2010) | 1 line #7802: fix invalid example (heh). ........ r77887 | georg.brandl | 2010-01-31 12:51:49 -0600 (Sun, 31 Jan 2010) | 5 lines Fix-up ftplib documentation: move exception descriptions to toplevel, not inside a class remove attribution in "versionadded" spell and grammar check docstring of FTP_TLS ........ r77889 | michael.foord | 2010-01-31 13:59:26 -0600 (Sun, 31 Jan 2010) | 1 line Minor modification to unittest documentation. ........
2010-02-02 22:35:45 -04:00
# two humongous values from issue 7743
'116512874940594195638617907092569881519034793229385' #...
'228569165191541890846564669771714896916084883987920' #...
'473321268100296857636200926065340769682863349205363' #...
'349247637660671783209907949273683040397979984107806' #...
'461822693332712828397617946036239581632976585100633' #...
'520260770761060725403904123144384571612073732754774' #...
'588211944406465572591022081973828448927338602556287' #...
'851831745419397433012491884869454462440536895047499' #...
'436551974649731917170099387762871020403582994193439' #...
'761933412166821484015883631622539314203799034497982' #...
'130038741741727907429575673302461380386596501187482' #...
'006257527709842179336488381672818798450229339123527' #...
'858844448336815912020452294624916993546388956561522' #...
'161875352572590420823607478788399460162228308693742' #...
'05287663441403533948204085390898399055004119873046875e-1075',
'525440653352955266109661060358202819561258984964913' #...
'892256527849758956045218257059713765874251436193619' #...
'443248205998870001633865657517447355992225852945912' #...
'016668660000210283807209850662224417504752264995360' #...
'631512007753855801075373057632157738752800840302596' #...
'237050247910530538250008682272783660778181628040733' #...
'653121492436408812668023478001208529190359254322340' #...
'397575185248844788515410722958784640926528544043090' #...
'115352513640884988017342469275006999104519620946430' #...
'818767147966495485406577703972687838176778993472989' #...
'561959000047036638938396333146685137903018376496408' #...
'319705333868476925297317136513970189073693314710318' #...
'991252811050501448326875232850600451776091303043715' #...
'157191292827614046876950225714743118291034780466325' #...
'085141343734564915193426994587206432697337118211527' #...
'278968731294639353354774788602467795167875117481660' #...
'4738791256853675690543663283782215866825e-1180',
# exercise exit conditions in bigcomp comparison loop
'2602129298404963083833853479113577253105939995688e2',
'260212929840496308383385347911357725310593999568896e0',
'26021292984049630838338534791135772531059399956889601e-2',
'260212929840496308383385347911357725310593999568895e0',
'260212929840496308383385347911357725310593999568897e0',
'260212929840496308383385347911357725310593999568996e0',
'260212929840496308383385347911357725310593999568866e0',
# 2**53
'9007199254740992.00',
# 2**1024 - 2**970: exact overflow boundary. All values
# smaller than this should round to something finite; any value
# greater than or equal to this one overflows.
'179769313486231580793728971405303415079934132710037' #...
'826936173778980444968292764750946649017977587207096' #...
'330286416692887910946555547851940402630657488671505' #...
'820681908902000708383676273854845817711531764475730' #...
'270069855571366959622842914819860834936475292719074' #...
'168444365510704342711559699508093042880177904174497792',
# 2**1024 - 2**970 - tiny
'179769313486231580793728971405303415079934132710037' #...
'826936173778980444968292764750946649017977587207096' #...
'330286416692887910946555547851940402630657488671505' #...
'820681908902000708383676273854845817711531764475730' #...
'270069855571366959622842914819860834936475292719074' #...
'168444365510704342711559699508093042880177904174497791.999',
# 2**1024 - 2**970 + tiny
'179769313486231580793728971405303415079934132710037' #...
'826936173778980444968292764750946649017977587207096' #...
'330286416692887910946555547851940402630657488671505' #...
'820681908902000708383676273854845817711531764475730' #...
'270069855571366959622842914819860834936475292719074' #...
'168444365510704342711559699508093042880177904174497792.001',
# 1 - 2**-54, +-tiny
'999999999999999944488848768742172978818416595458984375e-54',
'9999999999999999444888487687421729788184165954589843749999999e-54',
'9999999999999999444888487687421729788184165954589843750000001e-54',
# Value found by Rick Regan that gives a result of 2**-968
# under Gay's dtoa.c (as of Nov 04, 2010); since fixed.
# (Fixed some time ago in Python's dtoa.c.)
'0.0000000000000000000000000000000000000000100000000' #...
'000000000576129113423785429971690421191214034235435' #...
'087147763178149762956868991692289869941246658073194' #...
'51982237978882039897143840789794921875',
Merged revisions 77477-77478,77481-77483,77490-77493 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77477 | mark.dickinson | 2010-01-13 18:21:53 +0000 (Wed, 13 Jan 2010) | 1 line Add comments explaining the role of the bigcomp function in dtoa.c. ........ r77478 | mark.dickinson | 2010-01-13 19:02:37 +0000 (Wed, 13 Jan 2010) | 1 line Clarify that sulp expects a nonnegative input, but that +0.0 is fine. ........ r77481 | mark.dickinson | 2010-01-13 20:55:03 +0000 (Wed, 13 Jan 2010) | 1 line Simplify and annotate the bigcomp function, removing unused special cases. ........ r77482 | mark.dickinson | 2010-01-13 22:15:53 +0000 (Wed, 13 Jan 2010) | 1 line Fix buggy comparison: LHS of comparison was being treated as unsigned. ........ r77483 | mark.dickinson | 2010-01-13 22:20:10 +0000 (Wed, 13 Jan 2010) | 1 line More dtoa.c cleanup; remove the need for bc.dplen, bc.dp0 and bc.dp1. ........ r77490 | mark.dickinson | 2010-01-14 13:02:36 +0000 (Thu, 14 Jan 2010) | 1 line Fix off-by-one error introduced in r77483. I have a test for this, but it currently fails due to a different dtoa.c bug; I'll add the test once that bug is fixed. ........ r77491 | mark.dickinson | 2010-01-14 13:14:49 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix a dtoa.c bug (bug 6) causing incorrect rounding. Tests to follow. ........ r77492 | mark.dickinson | 2010-01-14 14:40:20 +0000 (Thu, 14 Jan 2010) | 1 line Issue 7632: fix incorrect rounding for long input strings with values very close to a power of 2. (See Bug 4 in the tracker discussion.) ........ r77493 | mark.dickinson | 2010-01-14 15:22:33 +0000 (Thu, 14 Jan 2010) | 1 line Issue #7632: add tests for bugs fixed so far. ........
2010-01-14 11:37:49 -04:00
]
for s in test_strings:
self.check_strtod(s)
def test_main():
test.support.run_unittest(StrtodTests)
if __name__ == "__main__":
test_main()