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Issue #4812: further renaming of internal Decimal constants, for clarity.

This commit is contained in:
Mark Dickinson 2009-01-03 12:07:20 +00:00
parent c5de0969ca
commit 4aa04db573
1 changed files with 56 additions and 56 deletions
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112
Lib/decimal.py
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@ -242,7 +242,7 @@ class DivisionByZero(DecimalException, ZeroDivisionError):
""" """
def handle(self, context, sign, *args): def handle(self, context, sign, *args):
return _Infsign[sign] return _SignedInfinity[sign]
class DivisionImpossible(InvalidOperation): class DivisionImpossible(InvalidOperation):
"""Cannot perform the division adequately. """Cannot perform the division adequately.
@ -340,15 +340,15 @@ 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 _SignedInfinity[sign]
if sign == 0: if sign == 0:
if context.rounding == ROUND_CEILING: if context.rounding == ROUND_CEILING:
return _Infsign[sign] return _SignedInfinity[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 _SignedInfinity[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)
@ -1171,12 +1171,12 @@ class Decimal(object):
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 _SignedInfinity[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 _SignedInfinity[resultsign]
resultexp = self._exp + other._exp resultexp = self._exp + other._exp
@ -1226,7 +1226,7 @@ class Decimal(object):
return context._raise_error(InvalidOperation, '(+-)INF/(+-)INF') return context._raise_error(InvalidOperation, '(+-)INF/(+-)INF')
if self._isinfinity(): if self._isinfinity():
return _Infsign[sign] return _SignedInfinity[sign]
if other._isinfinity(): if other._isinfinity():
context._raise_error(Clamped, 'Division by infinity') context._raise_error(Clamped, 'Division by infinity')
@ -1329,7 +1329,7 @@ class Decimal(object):
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 (_SignedInfinity[sign],
context._raise_error(InvalidOperation, 'INF % x')) context._raise_error(InvalidOperation, 'INF % x'))
if not other: if not other:
@ -1477,7 +1477,7 @@ class Decimal(object):
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 _SignedInfinity[self._sign ^ other._sign]
if not other: if not other:
if self: if self:
@ -1732,12 +1732,12 @@ class Decimal(object):
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 = _SignedInfinity[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 = _SignedInfinity[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)),
@ -2087,7 +2087,7 @@ class Decimal(object):
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 _One
# 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
@ -2109,19 +2109,19 @@ class Decimal(object):
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 _SignedInfinity[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 _SignedInfinity[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 == _One:
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
@ -2154,7 +2154,7 @@ class Decimal(object):
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 _SignedInfinity[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.
@ -2674,9 +2674,9 @@ class Decimal(object):
""" """
# 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 _NegativeOne
if not self._sign and other._sign: if not self._sign and other._sign:
return _Dec_p1 return _One
sign = self._sign sign = self._sign
# let's handle both NaN types # let's handle both NaN types
@ -2686,51 +2686,51 @@ class Decimal(object):
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 _One
else: else:
return _Dec_n1 return _NegativeOne
if self._int > other._int: if self._int > other._int:
if sign: if sign:
return _Dec_n1 return _NegativeOne
else: else:
return _Dec_p1 return _One
return _Dec_0 return _Zero
if sign: if sign:
if self_nan == 1: if self_nan == 1:
return _Dec_n1 return _NegativeOne
if other_nan == 1: if other_nan == 1:
return _Dec_p1 return _One
if self_nan == 2: if self_nan == 2:
return _Dec_n1 return _NegativeOne
if other_nan == 2: if other_nan == 2:
return _Dec_p1 return _One
else: else:
if self_nan == 1: if self_nan == 1:
return _Dec_p1 return _One
if other_nan == 1: if other_nan == 1:
return _Dec_n1 return _NegativeOne
if self_nan == 2: if self_nan == 2:
return _Dec_p1 return _One
if other_nan == 2: if other_nan == 2:
return _Dec_n1 return _NegativeOne
if self < other: if self < other:
return _Dec_n1 return _NegativeOne
if self > other: if self > other:
return _Dec_p1 return _One
if self._exp < other._exp: if self._exp < other._exp:
if sign: if sign:
return _Dec_p1 return _One
else: else:
return _Dec_n1 return _NegativeOne
if self._exp > other._exp: if self._exp > other._exp:
if sign: if sign:
return _Dec_n1 return _NegativeOne
else: else:
return _Dec_p1 return _One
return _Dec_0 return _Zero
def compare_total_mag(self, other): def compare_total_mag(self, other):
@ -2771,11 +2771,11 @@ class Decimal(object):
# exp(-Infinity) = 0 # exp(-Infinity) = 0
if self._isinfinity() == -1: if self._isinfinity() == -1:
return _Dec_0 return _Zero
# exp(0) = 1 # exp(0) = 1
if not self: if not self:
return _Dec_p1 return _One
# exp(Infinity) = Infinity # exp(Infinity) = Infinity
if self._isinfinity() == 1: if self._isinfinity() == 1:
@ -2927,15 +2927,15 @@ class Decimal(object):
# ln(0.0) == -Infinity # ln(0.0) == -Infinity
if not self: if not self:
return _negInf return _NegativeInfinity
# ln(Infinity) = Infinity # ln(Infinity) = Infinity
if self._isinfinity() == 1: if self._isinfinity() == 1:
return _Inf return _Infinity
# ln(1.0) == 0.0 # ln(1.0) == 0.0
if self == _Dec_p1: if self == _One:
return _Dec_0 return _Zero
# ln(negative) raises InvalidOperation # ln(negative) raises InvalidOperation
if self._sign == 1: if self._sign == 1:
@ -3007,11 +3007,11 @@ class Decimal(object):
# log10(0.0) == -Infinity # log10(0.0) == -Infinity
if not self: if not self:
return _negInf return _NegativeInfinity
# log10(Infinity) = Infinity # log10(Infinity) = Infinity
if self._isinfinity() == 1: if self._isinfinity() == 1:
return _Inf return _Infinity
# log10(negative or -Infinity) raises InvalidOperation # log10(negative or -Infinity) raises InvalidOperation
if self._sign == 1: if self._sign == 1:
@ -3063,7 +3063,7 @@ class Decimal(object):
# logb(+/-Inf) = +Inf # logb(+/-Inf) = +Inf
if self._isinfinity(): if self._isinfinity():
return _Inf return _Infinity
# logb(0) = -Inf, DivisionByZero # logb(0) = -Inf, DivisionByZero
if not self: if not self:
@ -3220,7 +3220,7 @@ class Decimal(object):
return ans return ans
if self._isinfinity() == -1: if self._isinfinity() == -1:
return _negInf return _NegativeInfinity
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())
@ -3243,7 +3243,7 @@ class Decimal(object):
return ans return ans
if self._isinfinity() == 1: if self._isinfinity() == 1:
return _Inf return _Infinity
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())
@ -5490,15 +5490,15 @@ def _format_align(body, spec_dict):
##### Useful Constants (internal use only) ################################ ##### Useful Constants (internal use only) ################################
# Reusable defaults # Reusable defaults
_Inf = Decimal('Inf') _Infinity = Decimal('Inf')
_negInf = Decimal('-Inf') _NegativeInfinity = Decimal('-Inf')
_NaN = Decimal('NaN') _NaN = Decimal('NaN')
_Dec_0 = Decimal(0) _Zero = Decimal(0)
_Dec_p1 = Decimal(1) _One = Decimal(1)
_Dec_n1 = Decimal(-1) _NegativeOne = Decimal(-1)
# _Infsign[sign] is infinity w/ that sign # _SignedInfinity[sign] is infinity w/ that sign
_Infsign = (_Inf, _negInf) _SignedInfinity = (_Infinity, _NegativeInfinity)