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  r68182 | mark.dickinson | 2009-01-02 23:07:08 +0000 (Fri, 02 Jan 2009) | 4 lines

  Issue #4812: add missing underscore prefix to some internal-use-only
  constants in the decimal module.  (Dec_0 becomes _Dec_0, etc.)
........
This commit is contained in:
Mark Dickinson 2009-01-02 23:23:21 +00:00
parent ad9d96bc1a
commit f923641b41
2 changed files with 65 additions and 62 deletions
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124
Lib/decimal.py
View file

@ -217,7 +217,7 @@ def handle(self, context, *args):
if args: if args:
ans = _dec_from_triple(args[0]._sign, args[0]._int, 'n', True) ans = _dec_from_triple(args[0]._sign, args[0]._int, 'n', True)
return ans._fix_nan(context) return ans._fix_nan(context)
return NaN return _NaN
class ConversionSyntax(InvalidOperation): class ConversionSyntax(InvalidOperation):
"""Trying to convert badly formed string. """Trying to convert badly formed string.
@ -227,7 +227,7 @@ class ConversionSyntax(InvalidOperation):
syntax. The result is [0,qNaN]. syntax. The result is [0,qNaN].
""" """
def handle(self, context, *args): def handle(self, context, *args):
return NaN return _NaN
class DivisionByZero(DecimalException, ZeroDivisionError): class DivisionByZero(DecimalException, ZeroDivisionError):
"""Division by 0. """Division by 0.
@ -243,7 +243,7 @@ class DivisionByZero(DecimalException, ZeroDivisionError):
""" """
def handle(self, context, sign, *args): def handle(self, context, sign, *args):
return Infsign[sign] return _Infsign[sign]
class DivisionImpossible(InvalidOperation): class DivisionImpossible(InvalidOperation):
"""Cannot perform the division adequately. """Cannot perform the division adequately.
@ -254,7 +254,7 @@ class DivisionImpossible(InvalidOperation):
""" """
def handle(self, context, *args): def handle(self, context, *args):
return NaN return _NaN
class DivisionUndefined(InvalidOperation, ZeroDivisionError): class DivisionUndefined(InvalidOperation, ZeroDivisionError):
"""Undefined result of division. """Undefined result of division.
@ -265,7 +265,7 @@ class DivisionUndefined(InvalidOperation, ZeroDivisionError):
""" """
def handle(self, context, *args): def handle(self, context, *args):
return NaN return _NaN
class Inexact(DecimalException): class Inexact(DecimalException):
"""Had to round, losing information. """Had to round, losing information.
@ -291,7 +291,7 @@ class InvalidContext(InvalidOperation):
""" """
def handle(self, context, *args): def handle(self, context, *args):
return NaN return _NaN
class Rounded(DecimalException): class Rounded(DecimalException):
"""Number got rounded (not necessarily changed during rounding). """Number got rounded (not necessarily changed during rounding).
@ -341,15 +341,15 @@ class Overflow(Inexact, Rounded):
def handle(self, context, sign, *args): def handle(self, context, sign, *args):
if context.rounding in (ROUND_HALF_UP, ROUND_HALF_EVEN, if context.rounding in (ROUND_HALF_UP, ROUND_HALF_EVEN,
ROUND_HALF_DOWN, ROUND_UP): ROUND_HALF_DOWN, ROUND_UP):
return Infsign[sign] return _Infsign[sign]
if sign == 0: if sign == 0:
if context.rounding == ROUND_CEILING: if context.rounding == ROUND_CEILING:
return Infsign[sign] return _Infsign[sign]
return _dec_from_triple(sign, '9'*context.prec, return _dec_from_triple(sign, '9'*context.prec,
context.Emax-context.prec+1) context.Emax-context.prec+1)
if sign == 1: if sign == 1:
if context.rounding == ROUND_FLOOR: if context.rounding == ROUND_FLOOR:
return Infsign[sign] return _Infsign[sign]
return _dec_from_triple(sign, '9'*context.prec, return _dec_from_triple(sign, '9'*context.prec,
context.Emax-context.prec+1) context.Emax-context.prec+1)
@ -1173,12 +1173,12 @@ def __mul__(self, other, context=None):
if self._isinfinity(): if self._isinfinity():
if not other: if not other:
return context._raise_error(InvalidOperation, '(+-)INF * 0') return context._raise_error(InvalidOperation, '(+-)INF * 0')
return Infsign[resultsign] return _Infsign[resultsign]
if other._isinfinity(): if other._isinfinity():
if not self: if not self:
return context._raise_error(InvalidOperation, '0 * (+-)INF') return context._raise_error(InvalidOperation, '0 * (+-)INF')
return Infsign[resultsign] return _Infsign[resultsign]
resultexp = self._exp + other._exp resultexp = self._exp + other._exp
@ -1228,7 +1228,7 @@ def __truediv__(self, other, context=None):
return context._raise_error(InvalidOperation, '(+-)INF/(+-)INF') return context._raise_error(InvalidOperation, '(+-)INF/(+-)INF')
if self._isinfinity(): if self._isinfinity():
return Infsign[sign] return _Infsign[sign]
if other._isinfinity(): if other._isinfinity():
context._raise_error(Clamped, 'Division by infinity') context._raise_error(Clamped, 'Division by infinity')
@ -1328,7 +1328,7 @@ def __divmod__(self, other, context=None):
ans = context._raise_error(InvalidOperation, 'divmod(INF, INF)') ans = context._raise_error(InvalidOperation, 'divmod(INF, INF)')
return ans, ans return ans, ans
else: else:
return (Infsign[sign], return (_Infsign[sign],
context._raise_error(InvalidOperation, 'INF % x')) context._raise_error(InvalidOperation, 'INF % x'))
if not other: if not other:
@ -1476,7 +1476,7 @@ def __floordiv__(self, other, context=None):
if other._isinfinity(): if other._isinfinity():
return context._raise_error(InvalidOperation, 'INF // INF') return context._raise_error(InvalidOperation, 'INF // INF')
else: else:
return Infsign[self._sign ^ other._sign] return _Infsign[self._sign ^ other._sign]
if not other: if not other:
if self: if self:
@ -1820,12 +1820,12 @@ def fma(self, other, third, context=None):
if not other: if not other:
return context._raise_error(InvalidOperation, return context._raise_error(InvalidOperation,
'INF * 0 in fma') 'INF * 0 in fma')
product = Infsign[self._sign ^ other._sign] product = _Infsign[self._sign ^ other._sign]
elif other._exp == 'F': elif other._exp == 'F':
if not self: if not self:
return context._raise_error(InvalidOperation, return context._raise_error(InvalidOperation,
'0 * INF in fma') '0 * INF in fma')
product = Infsign[self._sign ^ other._sign] product = _Infsign[self._sign ^ other._sign]
else: else:
product = _dec_from_triple(self._sign ^ other._sign, product = _dec_from_triple(self._sign ^ other._sign,
str(int(self._int) * int(other._int)), str(int(self._int) * int(other._int)),
@ -2175,7 +2175,7 @@ def __pow__(self, other, modulo=None, context=None):
if not self: if not self:
return context._raise_error(InvalidOperation, '0 ** 0') return context._raise_error(InvalidOperation, '0 ** 0')
else: else:
return Dec_p1 return _Dec_p1
# result has sign 1 iff self._sign is 1 and other is an odd integer # result has sign 1 iff self._sign is 1 and other is an odd integer
result_sign = 0 result_sign = 0
@ -2197,19 +2197,19 @@ def __pow__(self, other, modulo=None, context=None):
if other._sign == 0: if other._sign == 0:
return _dec_from_triple(result_sign, '0', 0) return _dec_from_triple(result_sign, '0', 0)
else: else:
return Infsign[result_sign] return _Infsign[result_sign]
# Inf**(+ve or Inf) = Inf; Inf**(-ve or -Inf) = 0 # Inf**(+ve or Inf) = Inf; Inf**(-ve or -Inf) = 0
if self._isinfinity(): if self._isinfinity():
if other._sign == 0: if other._sign == 0:
return Infsign[result_sign] return _Infsign[result_sign]
else: else:
return _dec_from_triple(result_sign, '0', 0) return _dec_from_triple(result_sign, '0', 0)
# 1**other = 1, but the choice of exponent and the flags # 1**other = 1, but the choice of exponent and the flags
# depend on the exponent of self, and on whether other is a # depend on the exponent of self, and on whether other is a
# positive integer, a negative integer, or neither # positive integer, a negative integer, or neither
if self == Dec_p1: if self == _Dec_p1:
if other._isinteger(): if other._isinteger():
# exp = max(self._exp*max(int(other), 0), # exp = max(self._exp*max(int(other), 0),
# 1-context.prec) but evaluating int(other) directly # 1-context.prec) but evaluating int(other) directly
@ -2242,7 +2242,7 @@ def __pow__(self, other, modulo=None, context=None):
if (other._sign == 0) == (self_adj < 0): if (other._sign == 0) == (self_adj < 0):
return _dec_from_triple(result_sign, '0', 0) return _dec_from_triple(result_sign, '0', 0)
else: else:
return Infsign[result_sign] return _Infsign[result_sign]
# from here on, the result always goes through the call # from here on, the result always goes through the call
# to _fix at the end of this function. # to _fix at the end of this function.
@ -2762,9 +2762,9 @@ def compare_total(self, other):
""" """
# if one is negative and the other is positive, it's easy # if one is negative and the other is positive, it's easy
if self._sign and not other._sign: if self._sign and not other._sign:
return Dec_n1 return _Dec_n1
if not self._sign and other._sign: if not self._sign and other._sign:
return Dec_p1 return _Dec_p1
sign = self._sign sign = self._sign
# let's handle both NaN types # let's handle both NaN types
@ -2774,51 +2774,51 @@ def compare_total(self, other):
if self_nan == other_nan: if self_nan == other_nan:
if self._int < other._int: if self._int < other._int:
if sign: if sign:
return Dec_p1 return _Dec_p1
else: else:
return Dec_n1 return _Dec_n1
if self._int > other._int: if self._int > other._int:
if sign: if sign:
return Dec_n1 return _Dec_n1
else: else:
return Dec_p1 return _Dec_p1
return Dec_0 return _Dec_0
if sign: if sign:
if self_nan == 1: if self_nan == 1:
return Dec_n1 return _Dec_n1
if other_nan == 1: if other_nan == 1:
return Dec_p1 return _Dec_p1
if self_nan == 2: if self_nan == 2:
return Dec_n1 return _Dec_n1
if other_nan == 2: if other_nan == 2:
return Dec_p1 return _Dec_p1
else: else:
if self_nan == 1: if self_nan == 1:
return Dec_p1 return _Dec_p1
if other_nan == 1: if other_nan == 1:
return Dec_n1 return _Dec_n1
if self_nan == 2: if self_nan == 2:
return Dec_p1 return _Dec_p1
if other_nan == 2: if other_nan == 2:
return Dec_n1 return _Dec_n1
if self < other: if self < other:
return Dec_n1 return _Dec_n1
if self > other: if self > other:
return Dec_p1 return _Dec_p1
if self._exp < other._exp: if self._exp < other._exp:
if sign: if sign:
return Dec_p1 return _Dec_p1
else: else:
return Dec_n1 return _Dec_n1
if self._exp > other._exp: if self._exp > other._exp:
if sign: if sign:
return Dec_n1 return _Dec_n1
else: else:
return Dec_p1 return _Dec_p1
return Dec_0 return _Dec_0
def compare_total_mag(self, other): def compare_total_mag(self, other):
@ -2859,11 +2859,11 @@ def exp(self, context=None):
# exp(-Infinity) = 0 # exp(-Infinity) = 0
if self._isinfinity() == -1: if self._isinfinity() == -1:
return Dec_0 return _Dec_0
# exp(0) = 1 # exp(0) = 1
if not self: if not self:
return Dec_p1 return _Dec_p1
# exp(Infinity) = Infinity # exp(Infinity) = Infinity
if self._isinfinity() == 1: if self._isinfinity() == 1:
@ -3015,15 +3015,15 @@ def ln(self, context=None):
# ln(0.0) == -Infinity # ln(0.0) == -Infinity
if not self: if not self:
return negInf return _negInf
# ln(Infinity) = Infinity # ln(Infinity) = Infinity
if self._isinfinity() == 1: if self._isinfinity() == 1:
return Inf return _Inf
# ln(1.0) == 0.0 # ln(1.0) == 0.0
if self == Dec_p1: if self == _Dec_p1:
return Dec_0 return _Dec_0
# ln(negative) raises InvalidOperation # ln(negative) raises InvalidOperation
if self._sign == 1: if self._sign == 1:
@ -3095,11 +3095,11 @@ def log10(self, context=None):
# log10(0.0) == -Infinity # log10(0.0) == -Infinity
if not self: if not self:
return negInf return _negInf
# log10(Infinity) = Infinity # log10(Infinity) = Infinity
if self._isinfinity() == 1: if self._isinfinity() == 1:
return Inf return _Inf
# log10(negative or -Infinity) raises InvalidOperation # log10(negative or -Infinity) raises InvalidOperation
if self._sign == 1: if self._sign == 1:
@ -3151,7 +3151,7 @@ def logb(self, context=None):
# logb(+/-Inf) = +Inf # logb(+/-Inf) = +Inf
if self._isinfinity(): if self._isinfinity():
return Inf return _Inf
# logb(0) = -Inf, DivisionByZero # logb(0) = -Inf, DivisionByZero
if not self: if not self:
@ -3308,7 +3308,7 @@ def next_minus(self, context=None):
return ans return ans
if self._isinfinity() == -1: if self._isinfinity() == -1:
return negInf return _negInf
if self._isinfinity() == 1: if self._isinfinity() == 1:
return _dec_from_triple(0, '9'*context.prec, context.Etop()) return _dec_from_triple(0, '9'*context.prec, context.Etop())
@ -3331,7 +3331,7 @@ def next_plus(self, context=None):
return ans return ans
if self._isinfinity() == 1: if self._isinfinity() == 1:
return Inf return _Inf
if self._isinfinity() == -1: if self._isinfinity() == -1:
return _dec_from_triple(1, '9'*context.prec, context.Etop()) return _dec_from_triple(1, '9'*context.prec, context.Etop())
@ -5572,15 +5572,15 @@ def _format_align(body, spec_dict):
##### Useful Constants (internal use only) ################################ ##### Useful Constants (internal use only) ################################
# Reusable defaults # Reusable defaults
Inf = Decimal('Inf') _Inf = Decimal('Inf')
negInf = Decimal('-Inf') _negInf = Decimal('-Inf')
NaN = Decimal('NaN') _NaN = Decimal('NaN')
Dec_0 = Decimal(0) _Dec_0 = Decimal(0)
Dec_p1 = Decimal(1) _Dec_p1 = Decimal(1)
Dec_n1 = Decimal(-1) _Dec_n1 = Decimal(-1)
# Infsign[sign] is infinity w/ that sign # _Infsign[sign] is infinity w/ that sign
Infsign = (Inf, negInf) _Infsign = (_Inf, _negInf)

3
Misc/NEWS
View file

@ -78,6 +78,9 @@ Core and Builtins
Library Library
------- -------
- Issue #4812: add missing underscore prefix to some internal-use-only
constants in the decimal module. (Dec_0 becomes _Dec_0, etc.)
- Issue #4702: Throwing a DistutilsPlatformError instead of IOError in case - Issue #4702: Throwing a DistutilsPlatformError instead of IOError in case
no MSVC compiler is found under Windows. Original patch by Philip Jenvey. no MSVC compiler is found under Windows. Original patch by Philip Jenvey.