traverseda
/
cpython
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

* Make the tests independent of the default precision. 

* Change the default precision to 28 (to match VB's decimal type).
This commit is contained in:
Raymond Hettinger 2004-07-03 12:26:21 +00:00
parent 17c52d8493
commit 6ea4845822
2 changed files with 127 additions and 119 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

239
Lib/decimal.py
View File

@ -10,7 +10,6 @@
# Todo:
# Provide a clean way of attaching monetary format representations
# Make tests independent of DefaultContext.prec == 9
"""
@ -41,6 +40,7 @@ of the expected Decimal("0.00") returned by decimal floating point).
Here are some examples of using the decimal module:
>>> from decimal import *
>>> getcontext().prec=9
>>> Decimal(0)
Decimal("0")
>>> Decimal("1")
@ -129,7 +129,7 @@ __all__ = [
'Underflow',
# Module parameters
'SINGLE_PRECISION', 'DEFAULT_MAX_EXPONENT', 'DEFAULT_MIN_EXPONENT',
'DEFAULT_MAX_EXPONENT', 'DEFAULT_MIN_EXPONENT',
# Constants for use in setting up contexts
'ROUND_DOWN', 'ROUND_HALF_UP', 'ROUND_HALF_EVEN', 'ROUND_CEILING',
@ -149,9 +149,6 @@ import math
import operator
xor = operator.xor
#Precision
SINGLE_PRECISION = 9
#Exponent Range
DEFAULT_MAX_EXPONENT = 999999999
DEFAULT_MIN_EXPONENT = -999999999
@ -425,6 +422,8 @@ if hasattr(threading.currentThread(), '__decimal_context__'):
def setcontext(context):
"""Set this thread's context to context."""
if context == DefaultContext:
context = Context()
threading.currentThread().__decimal_context__ = context
def getcontext():
@ -2265,13 +2264,13 @@ class Context(object):
operation on the operand. Otherwise, the result is the same as using
the plus operation on the operand.
>>> DefaultContext.abs(Decimal('2.1'))
>>> ExtendedDefaultContext.abs(Decimal('2.1'))
Decimal("2.1")
>>> DefaultContext.abs(Decimal('-100'))
>>> ExtendedDefaultContext.abs(Decimal('-100'))
Decimal("100")
>>> DefaultContext.abs(Decimal('101.5'))
>>> ExtendedDefaultContext.abs(Decimal('101.5'))
Decimal("101.5")
>>> DefaultContext.abs(Decimal('-101.5'))
>>> ExtendedDefaultContext.abs(Decimal('-101.5'))
Decimal("101.5")
"""
return a.__abs__(context=self)
@ -2279,9 +2278,9 @@ class Context(object):
def add(self, a, b):
"""Return the sum of the two operands.
>>> DefaultContext.add(Decimal('12'), Decimal('7.00'))
>>> ExtendedDefaultContext.add(Decimal('12'), Decimal('7.00'))
Decimal("19.00")
>>> DefaultContext.add(Decimal('1E+2'), Decimal('1.01E+4'))
>>> ExtendedDefaultContext.add(Decimal('1E+2'), Decimal('1.01E+4'))
Decimal("1.02E+4")
"""
return a.__add__(b, context=self)
@ -2303,17 +2302,17 @@ class Context(object):
subtraction: '-1' if the result is less than zero, '0' if the result is
zero or negative zero, or '1' if the result is greater than zero.
>>> DefaultContext.compare(Decimal('2.1'), Decimal('3'))
>>> ExtendedDefaultContext.compare(Decimal('2.1'), Decimal('3'))
Decimal("-1")
>>> DefaultContext.compare(Decimal('2.1'), Decimal('2.1'))
>>> ExtendedDefaultContext.compare(Decimal('2.1'), Decimal('2.1'))
Decimal("0")
>>> DefaultContext.compare(Decimal('2.1'), Decimal('2.10'))
>>> ExtendedDefaultContext.compare(Decimal('2.1'), Decimal('2.10'))
Decimal("0")
>>> DefaultContext.compare(Decimal('3'), Decimal('2.1'))
>>> ExtendedDefaultContext.compare(Decimal('3'), Decimal('2.1'))
Decimal("1")
>>> DefaultContext.compare(Decimal('2.1'), Decimal('-3'))
>>> ExtendedDefaultContext.compare(Decimal('2.1'), Decimal('-3'))
Decimal("1")
>>> DefaultContext.compare(Decimal('-3'), Decimal('2.1'))
>>> ExtendedDefaultContext.compare(Decimal('-3'), Decimal('2.1'))
Decimal("-1")
"""
return a.compare(b, context=self)
@ -2321,25 +2320,25 @@ class Context(object):
def divide(self, a, b):
"""Decimal division in a specified context.
>>> DefaultContext.divide(Decimal('1'), Decimal('3'))
>>> ExtendedDefaultContext.divide(Decimal('1'), Decimal('3'))
Decimal("0.333333333")
>>> DefaultContext.divide(Decimal('2'), Decimal('3'))
>>> ExtendedDefaultContext.divide(Decimal('2'), Decimal('3'))
Decimal("0.666666667")
>>> DefaultContext.divide(Decimal('5'), Decimal('2'))
>>> ExtendedDefaultContext.divide(Decimal('5'), Decimal('2'))
Decimal("2.5")
>>> DefaultContext.divide(Decimal('1'), Decimal('10'))
>>> ExtendedDefaultContext.divide(Decimal('1'), Decimal('10'))
Decimal("0.1")
>>> DefaultContext.divide(Decimal('12'), Decimal('12'))
>>> ExtendedDefaultContext.divide(Decimal('12'), Decimal('12'))
Decimal("1")
>>> DefaultContext.divide(Decimal('8.00'), Decimal('2'))
>>> ExtendedDefaultContext.divide(Decimal('8.00'), Decimal('2'))
Decimal("4.00")
>>> DefaultContext.divide(Decimal('2.400'), Decimal('2.0'))
>>> ExtendedDefaultContext.divide(Decimal('2.400'), Decimal('2.0'))
Decimal("1.20")
>>> DefaultContext.divide(Decimal('1000'), Decimal('100'))
>>> ExtendedDefaultContext.divide(Decimal('1000'), Decimal('100'))
Decimal("10")
>>> DefaultContext.divide(Decimal('1000'), Decimal('1'))
>>> ExtendedDefaultContext.divide(Decimal('1000'), Decimal('1'))
Decimal("1000")
>>> DefaultContext.divide(Decimal('2.40E+6'), Decimal('2'))
>>> ExtendedDefaultContext.divide(Decimal('2.40E+6'), Decimal('2'))
Decimal("1.20E+6")
"""
return a.__div__(b, context=self)
@ -2347,11 +2346,11 @@ class Context(object):
def divide_int(self, a, b):
"""Divides two numbers and returns the integer part of the result.
>>> DefaultContext.divide_int(Decimal('2'), Decimal('3'))
>>> ExtendedDefaultContext.divide_int(Decimal('2'), Decimal('3'))
Decimal("0")
>>> DefaultContext.divide_int(Decimal('10'), Decimal('3'))
>>> ExtendedDefaultContext.divide_int(Decimal('10'), Decimal('3'))
Decimal("3")
>>> DefaultContext.divide_int(Decimal('1'), Decimal('0.3'))
>>> ExtendedDefaultContext.divide_int(Decimal('1'), Decimal('0.3'))
Decimal("3")
"""
return a.__floordiv__(b, context=self)
@ -2368,11 +2367,11 @@ class Context(object):
is chosen as the result. Otherwise the maximum (closer to positive
infinity) of the two operands is chosen as the result.
>>> DefaultContext.max(Decimal('3'), Decimal('2'))
>>> ExtendedDefaultContext.max(Decimal('3'), Decimal('2'))
Decimal("3")
>>> DefaultContext.max(Decimal('-10'), Decimal('3'))
>>> ExtendedDefaultContext.max(Decimal('-10'), Decimal('3'))
Decimal("3")
>>> DefaultContext.max(Decimal('1.0'), Decimal('1'))
>>> ExtendedDefaultContext.max(Decimal('1.0'), Decimal('1'))
Decimal("1.0")
"""
return a.max(b, context=self)
@ -2386,11 +2385,11 @@ class Context(object):
is chosen as the result. Otherwise the minimum (closer to negative
infinity) of the two operands is chosen as the result.
>>> DefaultContext.min(Decimal('3'), Decimal('2'))
>>> ExtendedDefaultContext.min(Decimal('3'), Decimal('2'))
Decimal("2")
>>> DefaultContext.min(Decimal('-10'), Decimal('3'))
>>> ExtendedDefaultContext.min(Decimal('-10'), Decimal('3'))
Decimal("-10")
>>> DefaultContext.min(Decimal('1.0'), Decimal('1'))
>>> ExtendedDefaultContext.min(Decimal('1.0'), Decimal('1'))
Decimal("1.0")
"""
return a.min(b, context=self)
@ -2402,9 +2401,9 @@ class Context(object):
operation minus(a) is calculated as subtract('0', a) where the '0'
has the same exponent as the operand.
>>> DefaultContext.minus(Decimal('1.3'))
>>> ExtendedDefaultContext.minus(Decimal('1.3'))
Decimal("-1.3")
>>> DefaultContext.minus(Decimal('-1.3'))
>>> ExtendedDefaultContext.minus(Decimal('-1.3'))
Decimal("1.3")
"""
return a.__neg__(context=self)
@ -2417,15 +2416,15 @@ class Context(object):
resulting in a number which may be as long as the sum of the lengths
of the two operands.
>>> DefaultContext.multiply(Decimal('1.20'), Decimal('3'))
>>> ExtendedDefaultContext.multiply(Decimal('1.20'), Decimal('3'))
Decimal("3.60")
>>> DefaultContext.multiply(Decimal('7'), Decimal('3'))
>>> ExtendedDefaultContext.multiply(Decimal('7'), Decimal('3'))
Decimal("21")
>>> DefaultContext.multiply(Decimal('0.9'), Decimal('0.8'))
>>> ExtendedDefaultContext.multiply(Decimal('0.9'), Decimal('0.8'))
Decimal("0.72")
>>> DefaultContext.multiply(Decimal('0.9'), Decimal('-0'))
>>> ExtendedDefaultContext.multiply(Decimal('0.9'), Decimal('-0'))
Decimal("-0.0")
>>> DefaultContext.multiply(Decimal('654321'), Decimal('654321'))
>>> ExtendedDefaultContext.multiply(Decimal('654321'), Decimal('654321'))
Decimal("4.28135971E+11")
"""
return a.__mul__(b, context=self)
@ -2436,17 +2435,17 @@ class Context(object):
Essentially a plus operation with all trailing zeros removed from the
result.
>>> DefaultContext.normalize(Decimal('2.1'))
>>> ExtendedDefaultContext.normalize(Decimal('2.1'))
Decimal("2.1")
>>> DefaultContext.normalize(Decimal('-2.0'))
>>> ExtendedDefaultContext.normalize(Decimal('-2.0'))
Decimal("-2")
>>> DefaultContext.normalize(Decimal('1.200'))
>>> ExtendedDefaultContext.normalize(Decimal('1.200'))
Decimal("1.2")
>>> DefaultContext.normalize(Decimal('-120'))
>>> ExtendedDefaultContext.normalize(Decimal('-120'))
Decimal("-1.2E+2")
>>> DefaultContext.normalize(Decimal('120.00'))
>>> ExtendedDefaultContext.normalize(Decimal('120.00'))
Decimal("1.2E+2")
>>> DefaultContext.normalize(Decimal('0.00'))
>>> ExtendedDefaultContext.normalize(Decimal('0.00'))
Decimal("0")
"""
return a.normalize(context=self)
@ -2458,9 +2457,9 @@ class Context(object):
operation plus(a) is calculated as add('0', a) where the '0'
has the same exponent as the operand.
>>> DefaultContext.plus(Decimal('1.3'))
>>> ExtendedDefaultContext.plus(Decimal('1.3'))
Decimal("1.3")
>>> DefaultContext.plus(Decimal('-1.3'))
>>> ExtendedDefaultContext.plus(Decimal('-1.3'))
Decimal("-1.3")
"""
return a.__pos__(context=self)
@ -2483,33 +2482,33 @@ class Context(object):
division into 1, the operation is not halted at that point but
continues.
>>> DefaultContext.power(Decimal('2'), Decimal('3'))
>>> ExtendedDefaultContext.power(Decimal('2'), Decimal('3'))
Decimal("8")
>>> DefaultContext.power(Decimal('2'), Decimal('-3'))
>>> ExtendedDefaultContext.power(Decimal('2'), Decimal('-3'))
Decimal("0.125")
>>> DefaultContext.power(Decimal('1.7'), Decimal('8'))
>>> ExtendedDefaultContext.power(Decimal('1.7'), Decimal('8'))
Decimal("69.7575744")
>>> DefaultContext.power(Decimal('Infinity'), Decimal('-2'))
>>> ExtendedDefaultContext.power(Decimal('Infinity'), Decimal('-2'))
Decimal("0")
>>> DefaultContext.power(Decimal('Infinity'), Decimal('-1'))
>>> ExtendedDefaultContext.power(Decimal('Infinity'), Decimal('-1'))
Decimal("0")
>>> DefaultContext.power(Decimal('Infinity'), Decimal('0'))
>>> ExtendedDefaultContext.power(Decimal('Infinity'), Decimal('0'))
Decimal("1")
>>> DefaultContext.power(Decimal('Infinity'), Decimal('1'))
>>> ExtendedDefaultContext.power(Decimal('Infinity'), Decimal('1'))
Decimal("Infinity")
>>> DefaultContext.power(Decimal('Infinity'), Decimal('2'))
>>> ExtendedDefaultContext.power(Decimal('Infinity'), Decimal('2'))
Decimal("Infinity")
>>> DefaultContext.power(Decimal('-Infinity'), Decimal('-2'))
>>> ExtendedDefaultContext.power(Decimal('-Infinity'), Decimal('-2'))
Decimal("0")
>>> DefaultContext.power(Decimal('-Infinity'), Decimal('-1'))
>>> ExtendedDefaultContext.power(Decimal('-Infinity'), Decimal('-1'))
Decimal("-0")
>>> DefaultContext.power(Decimal('-Infinity'), Decimal('0'))
>>> ExtendedDefaultContext.power(Decimal('-Infinity'), Decimal('0'))
Decimal("1")
>>> DefaultContext.power(Decimal('-Infinity'), Decimal('1'))
>>> ExtendedDefaultContext.power(Decimal('-Infinity'), Decimal('1'))
Decimal("-Infinity")
>>> DefaultContext.power(Decimal('-Infinity'), Decimal('2'))
>>> ExtendedDefaultContext.power(Decimal('-Infinity'), Decimal('2'))
Decimal("Infinity")
>>> DefaultContext.power(Decimal('0'), Decimal('0'))
>>> ExtendedDefaultContext.power(Decimal('0'), Decimal('0'))
Decimal("NaN")
"""
return a.__pow__(b, modulo, context=self)
@ -2532,35 +2531,35 @@ class Context(object):
Also unlike other operations, quantize will never raise Underflow, even
if the result is subnormal and inexact.
>>> DefaultContext.quantize(Decimal('2.17'), Decimal('0.001'))
>>> ExtendedDefaultContext.quantize(Decimal('2.17'), Decimal('0.001'))
Decimal("2.170")
>>> DefaultContext.quantize(Decimal('2.17'), Decimal('0.01'))
>>> ExtendedDefaultContext.quantize(Decimal('2.17'), Decimal('0.01'))
Decimal("2.17")
>>> DefaultContext.quantize(Decimal('2.17'), Decimal('0.1'))
>>> ExtendedDefaultContext.quantize(Decimal('2.17'), Decimal('0.1'))
Decimal("2.2")
>>> DefaultContext.quantize(Decimal('2.17'), Decimal('1e+0'))
>>> ExtendedDefaultContext.quantize(Decimal('2.17'), Decimal('1e+0'))
Decimal("2")
>>> DefaultContext.quantize(Decimal('2.17'), Decimal('1e+1'))
>>> ExtendedDefaultContext.quantize(Decimal('2.17'), Decimal('1e+1'))
Decimal("0E+1")
>>> DefaultContext.quantize(Decimal('-Inf'), Decimal('Infinity'))
>>> ExtendedDefaultContext.quantize(Decimal('-Inf'), Decimal('Infinity'))
Decimal("-Infinity")
>>> DefaultContext.quantize(Decimal('2'), Decimal('Infinity'))
>>> ExtendedDefaultContext.quantize(Decimal('2'), Decimal('Infinity'))
Decimal("NaN")
>>> DefaultContext.quantize(Decimal('-0.1'), Decimal('1'))
>>> ExtendedDefaultContext.quantize(Decimal('-0.1'), Decimal('1'))
Decimal("-0")
>>> DefaultContext.quantize(Decimal('-0'), Decimal('1e+5'))
>>> ExtendedDefaultContext.quantize(Decimal('-0'), Decimal('1e+5'))
Decimal("-0E+5")
>>> DefaultContext.quantize(Decimal('+35236450.6'), Decimal('1e-2'))
>>> ExtendedDefaultContext.quantize(Decimal('+35236450.6'), Decimal('1e-2'))
Decimal("NaN")
>>> DefaultContext.quantize(Decimal('-35236450.6'), Decimal('1e-2'))
>>> ExtendedDefaultContext.quantize(Decimal('-35236450.6'), Decimal('1e-2'))
Decimal("NaN")
>>> DefaultContext.quantize(Decimal('217'), Decimal('1e-1'))
>>> ExtendedDefaultContext.quantize(Decimal('217'), Decimal('1e-1'))
Decimal("217.0")
>>> DefaultContext.quantize(Decimal('217'), Decimal('1e-0'))
>>> ExtendedDefaultContext.quantize(Decimal('217'), Decimal('1e-0'))
Decimal("217")
>>> DefaultContext.quantize(Decimal('217'), Decimal('1e+1'))
>>> ExtendedDefaultContext.quantize(Decimal('217'), Decimal('1e+1'))
Decimal("2.2E+2")
>>> DefaultContext.quantize(Decimal('217'), Decimal('1e+2'))
>>> ExtendedDefaultContext.quantize(Decimal('217'), Decimal('1e+2'))
Decimal("2E+2")
"""
return a.quantize(b, context=self)
@ -2577,17 +2576,17 @@ class Context(object):
(that is, if integer division on the same two operands would fail, the
remainder cannot be calculated).
>>> DefaultContext.remainder(Decimal('2.1'), Decimal('3'))
>>> ExtendedDefaultContext.remainder(Decimal('2.1'), Decimal('3'))
Decimal("2.1")
>>> DefaultContext.remainder(Decimal('10'), Decimal('3'))
>>> ExtendedDefaultContext.remainder(Decimal('10'), Decimal('3'))
Decimal("1")
>>> DefaultContext.remainder(Decimal('-10'), Decimal('3'))
>>> ExtendedDefaultContext.remainder(Decimal('-10'), Decimal('3'))
Decimal("-1")
>>> DefaultContext.remainder(Decimal('10.2'), Decimal('1'))
>>> ExtendedDefaultContext.remainder(Decimal('10.2'), Decimal('1'))
Decimal("0.2")
>>> DefaultContext.remainder(Decimal('10'), Decimal('0.3'))
>>> ExtendedDefaultContext.remainder(Decimal('10'), Decimal('0.3'))
Decimal("0.1")
>>> DefaultContext.remainder(Decimal('3.6'), Decimal('1.3'))
>>> ExtendedDefaultContext.remainder(Decimal('3.6'), Decimal('1.3'))
Decimal("1.0")
"""
return a.__mod__(b, context=self)
@ -2602,19 +2601,19 @@ class Context(object):
(that is, if integer division on the same two operands would fail, the
remainder cannot be calculated).
>>> DefaultContext.remainder_near(Decimal('2.1'), Decimal('3'))
>>> ExtendedDefaultContext.remainder_near(Decimal('2.1'), Decimal('3'))
Decimal("-0.9")
>>> DefaultContext.remainder_near(Decimal('10'), Decimal('6'))
>>> ExtendedDefaultContext.remainder_near(Decimal('10'), Decimal('6'))
Decimal("-2")
>>> DefaultContext.remainder_near(Decimal('10'), Decimal('3'))
>>> ExtendedDefaultContext.remainder_near(Decimal('10'), Decimal('3'))
Decimal("1")
>>> DefaultContext.remainder_near(Decimal('-10'), Decimal('3'))
>>> ExtendedDefaultContext.remainder_near(Decimal('-10'), Decimal('3'))
Decimal("-1")
>>> DefaultContext.remainder_near(Decimal('10.2'), Decimal('1'))
>>> ExtendedDefaultContext.remainder_near(Decimal('10.2'), Decimal('1'))
Decimal("0.2")
>>> DefaultContext.remainder_near(Decimal('10'), Decimal('0.3'))
>>> ExtendedDefaultContext.remainder_near(Decimal('10'), Decimal('0.3'))
Decimal("0.1")
>>> DefaultContext.remainder_near(Decimal('3.6'), Decimal('1.3'))
>>> ExtendedDefaultContext.remainder_near(Decimal('3.6'), Decimal('1.3'))
Decimal("-0.3")
"""
return a.remainder_near(b, context=self)
@ -2625,13 +2624,13 @@ class Context(object):
The result is never affected by either the sign or the coefficient of
either operand.
>>> DefaultContext.same_quantum(Decimal('2.17'), Decimal('0.001'))
>>> ExtendedDefaultContext.same_quantum(Decimal('2.17'), Decimal('0.001'))
False
>>> DefaultContext.same_quantum(Decimal('2.17'), Decimal('0.01'))
>>> ExtendedDefaultContext.same_quantum(Decimal('2.17'), Decimal('0.01'))
True
>>> DefaultContext.same_quantum(Decimal('2.17'), Decimal('1'))
>>> ExtendedDefaultContext.same_quantum(Decimal('2.17'), Decimal('1'))
False
>>> DefaultContext.same_quantum(Decimal('Inf'), Decimal('-Inf'))
>>> ExtendedDefaultContext.same_quantum(Decimal('Inf'), Decimal('-Inf'))
True
"""
return a.same_quantum(b)
@ -2642,35 +2641,37 @@ class Context(object):
If the result must be inexact, it is rounded using the round-half-even
algorithm.
>>> DefaultContext.sqrt(Decimal('0'))
>>> ExtendedDefaultContext.sqrt(Decimal('0'))
Decimal("0")
>>> DefaultContext.sqrt(Decimal('-0'))
>>> ExtendedDefaultContext.sqrt(Decimal('-0'))
Decimal("-0")
>>> DefaultContext.sqrt(Decimal('0.39'))
>>> ExtendedDefaultContext.sqrt(Decimal('0.39'))
Decimal("0.624499800")
>>> DefaultContext.sqrt(Decimal('100'))
>>> ExtendedDefaultContext.sqrt(Decimal('100'))
Decimal("10")
>>> DefaultContext.sqrt(Decimal('1'))
>>> ExtendedDefaultContext.sqrt(Decimal('1'))
Decimal("1")
>>> DefaultContext.sqrt(Decimal('1.0'))
>>> ExtendedDefaultContext.sqrt(Decimal('1.0'))
Decimal("1.0")
>>> DefaultContext.sqrt(Decimal('1.00'))
>>> ExtendedDefaultContext.sqrt(Decimal('1.00'))
Decimal("1.0")
>>> DefaultContext.sqrt(Decimal('7'))
>>> ExtendedDefaultContext.sqrt(Decimal('7'))
Decimal("2.64575131")
>>> DefaultContext.sqrt(Decimal('10'))
>>> ExtendedDefaultContext.sqrt(Decimal('10'))
Decimal("3.16227766")
>>> ExtendedDefaultContext.prec
9
"""
return a.sqrt(context=self)
def subtract(self, a, b):
"""Return the sum of the two operands.
>>> DefaultContext.subtract(Decimal('1.3'), Decimal('1.07'))
>>> ExtendedDefaultContext.subtract(Decimal('1.3'), Decimal('1.07'))
Decimal("0.23")
>>> DefaultContext.subtract(Decimal('1.3'), Decimal('1.30'))
>>> ExtendedDefaultContext.subtract(Decimal('1.3'), Decimal('1.30'))
Decimal("0.00")
>>> DefaultContext.subtract(Decimal('1.3'), Decimal('2.07'))
>>> ExtendedDefaultContext.subtract(Decimal('1.3'), Decimal('2.07'))
Decimal("-0.77")
"""
return a.__sub__(b, context=self)
@ -2698,21 +2699,21 @@ class Context(object):
of the operand as the precision setting, except that no flags will
be set. The rounding mode is taken from the context.
>>> DefaultContext.to_integral(Decimal('2.1'))
>>> ExtendedDefaultContext.to_integral(Decimal('2.1'))
Decimal("2")
>>> DefaultContext.to_integral(Decimal('100'))
>>> ExtendedDefaultContext.to_integral(Decimal('100'))
Decimal("100")
>>> DefaultContext.to_integral(Decimal('100.0'))
>>> ExtendedDefaultContext.to_integral(Decimal('100.0'))
Decimal("100")
>>> DefaultContext.to_integral(Decimal('101.5'))
>>> ExtendedDefaultContext.to_integral(Decimal('101.5'))
Decimal("102")
>>> DefaultContext.to_integral(Decimal('-101.5'))
>>> ExtendedDefaultContext.to_integral(Decimal('-101.5'))
Decimal("-102")
>>> DefaultContext.to_integral(Decimal('10E+5'))
>>> ExtendedDefaultContext.to_integral(Decimal('10E+5'))
Decimal("1.0E+6")
>>> DefaultContext.to_integral(Decimal('7.89E+77'))
>>> ExtendedDefaultContext.to_integral(Decimal('7.89E+77'))
Decimal("7.89E+77")
>>> DefaultContext.to_integral(Decimal('-Inf'))
>>> ExtendedDefaultContext.to_integral(Decimal('-Inf'))
Decimal("-Infinity")
"""
return a.to_integral(context=self)
@ -2962,7 +2963,7 @@ _basic_traps.update({Inexact:0, Rounded:0, Subnormal:0})
# Is mutable, so than new contexts can have different default values
DefaultContext = Context(
prec=SINGLE_PRECISION, rounding=ROUND_HALF_EVEN,
prec=28, rounding=ROUND_HALF_EVEN,
trap_enablers=dict.fromkeys(Signals, 0),
flags=None,
_rounding_decision=ALWAYS_ROUND,
@ -2981,7 +2982,7 @@ BasicDefaultContext = Context(
)
ExtendedDefaultContext = Context(
prec=SINGLE_PRECISION, rounding=ROUND_HALF_EVEN,
prec=9, rounding=ROUND_HALF_EVEN,
trap_enablers=dict.fromkeys(Signals, 0),
flags=None,
_rounding_decision=ALWAYS_ROUND,

7
Lib/test/test_decimal.py
View File

@ -34,6 +34,13 @@ from decimal import *
from test.test_support import TestSkipped, run_unittest, run_doctest, is_resource_enabled
import threading
# Tests are built around these assumed context defaults
DefaultContext.prec=9
DefaultContext.rounding=ROUND_HALF_EVEN
DefaultContext.trap_enablers=dict.fromkeys(Signals, 0)
setcontext(DefaultContext)
TESTDATADIR = 'decimaltestdata'
if __name__ == '__main__':
file = sys.argv[0]