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Reapply r68191.
This commit is contained in:
Raymond Hettinger
parent
f4d8597a59
commit
b7e835b820
1 changed files with 56 additions and 56 deletions
112
Lib/decimal.py
112
Lib/decimal.py
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@ -243,7 +243,7 @@ class DivisionByZero(DecimalException, ZeroDivisionError):
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"""
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def handle(self, context, sign, *args):
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return _Infsign[sign]
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return _SignedInfinity[sign]
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class DivisionImpossible(InvalidOperation):
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"""Cannot perform the division adequately.
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@ -341,15 +341,15 @@ class Overflow(Inexact, Rounded):
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def handle(self, context, sign, *args):
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if context.rounding in (ROUND_HALF_UP, ROUND_HALF_EVEN,
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ROUND_HALF_DOWN, ROUND_UP):
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return _Infsign[sign]
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return _SignedInfinity[sign]
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if sign == 0:
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if context.rounding == ROUND_CEILING:
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return _Infsign[sign]
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return _SignedInfinity[sign]
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return _dec_from_triple(sign, '9'*context.prec,
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context.Emax-context.prec+1)
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if sign == 1:
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if context.rounding == ROUND_FLOOR:
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return _Infsign[sign]
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return _SignedInfinity[sign]
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return _dec_from_triple(sign, '9'*context.prec,
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context.Emax-context.prec+1)
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@ -1204,12 +1204,12 @@ class Decimal(object):
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if self._isinfinity():
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if not other:
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return context._raise_error(InvalidOperation, '(+-)INF * 0')
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return _Infsign[resultsign]
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return _SignedInfinity[resultsign]
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if other._isinfinity():
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if not self:
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return context._raise_error(InvalidOperation, '0 * (+-)INF')
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return _Infsign[resultsign]
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return _SignedInfinity[resultsign]
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resultexp = self._exp + other._exp
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@ -1259,7 +1259,7 @@ class Decimal(object):
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return context._raise_error(InvalidOperation, '(+-)INF/(+-)INF')
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if self._isinfinity():
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return _Infsign[sign]
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return _SignedInfinity[sign]
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if other._isinfinity():
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context._raise_error(Clamped, 'Division by infinity')
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@ -1362,7 +1362,7 @@ class Decimal(object):
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ans = context._raise_error(InvalidOperation, 'divmod(INF, INF)')
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return ans, ans
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else:
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return (_Infsign[sign],
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return (_SignedInfinity[sign],
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context._raise_error(InvalidOperation, 'INF % x'))
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if not other:
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@ -1510,7 +1510,7 @@ class Decimal(object):
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if other._isinfinity():
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return context._raise_error(InvalidOperation, 'INF // INF')
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else:
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return _Infsign[self._sign ^ other._sign]
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return _SignedInfinity[self._sign ^ other._sign]
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if not other:
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if self:
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@ -1765,12 +1765,12 @@ class Decimal(object):
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if not other:
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return context._raise_error(InvalidOperation,
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'INF * 0 in fma')
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product = _Infsign[self._sign ^ other._sign]
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product = _SignedInfinity[self._sign ^ other._sign]
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elif other._exp == 'F':
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if not self:
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return context._raise_error(InvalidOperation,
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'0 * INF in fma')
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product = _Infsign[self._sign ^ other._sign]
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product = _SignedInfinity[self._sign ^ other._sign]
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else:
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product = _dec_from_triple(self._sign ^ other._sign,
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str(int(self._int) * int(other._int)),
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@ -2120,7 +2120,7 @@ class Decimal(object):
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if not self:
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return context._raise_error(InvalidOperation, '0 ** 0')
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else:
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return _Dec_p1
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return _One
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# result has sign 1 iff self._sign is 1 and other is an odd integer
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result_sign = 0
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@ -2142,19 +2142,19 @@ class Decimal(object):
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if other._sign == 0:
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return _dec_from_triple(result_sign, '0', 0)
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else:
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return _Infsign[result_sign]
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return _SignedInfinity[result_sign]
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# Inf**(+ve or Inf) = Inf; Inf**(-ve or -Inf) = 0
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if self._isinfinity():
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if other._sign == 0:
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return _Infsign[result_sign]
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return _SignedInfinity[result_sign]
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else:
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return _dec_from_triple(result_sign, '0', 0)
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# 1**other = 1, but the choice of exponent and the flags
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# depend on the exponent of self, and on whether other is a
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# positive integer, a negative integer, or neither
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if self == _Dec_p1:
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if self == _One:
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if other._isinteger():
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# exp = max(self._exp*max(int(other), 0),
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# 1-context.prec) but evaluating int(other) directly
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@ -2187,7 +2187,7 @@ class Decimal(object):
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if (other._sign == 0) == (self_adj < 0):
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return _dec_from_triple(result_sign, '0', 0)
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else:
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return _Infsign[result_sign]
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return _SignedInfinity[result_sign]
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# from here on, the result always goes through the call
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# to _fix at the end of this function.
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@ -2707,9 +2707,9 @@ class Decimal(object):
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"""
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# if one is negative and the other is positive, it's easy
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if self._sign and not other._sign:
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return _Dec_n1
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return _NegativeOne
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if not self._sign and other._sign:
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return _Dec_p1
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return _One
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sign = self._sign
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# let's handle both NaN types
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@ -2719,51 +2719,51 @@ class Decimal(object):
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if self_nan == other_nan:
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if self._int < other._int:
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if sign:
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return _Dec_p1
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return _One
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else:
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return _Dec_n1
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return _NegativeOne
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if self._int > other._int:
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if sign:
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return _Dec_n1
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return _NegativeOne
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else:
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return _Dec_p1
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return _Dec_0
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return _One
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return _Zero
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if sign:
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if self_nan == 1:
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return _Dec_n1
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return _NegativeOne
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if other_nan == 1:
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return _Dec_p1
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return _One
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if self_nan == 2:
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return _Dec_n1
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return _NegativeOne
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if other_nan == 2:
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return _Dec_p1
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return _One
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else:
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if self_nan == 1:
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return _Dec_p1
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return _One
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if other_nan == 1:
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return _Dec_n1
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return _NegativeOne
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if self_nan == 2:
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return _Dec_p1
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return _One
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if other_nan == 2:
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return _Dec_n1
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return _NegativeOne
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if self < other:
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return _Dec_n1
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return _NegativeOne
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if self > other:
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return _Dec_p1
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return _One
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if self._exp < other._exp:
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if sign:
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return _Dec_p1
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return _One
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else:
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return _Dec_n1
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return _NegativeOne
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if self._exp > other._exp:
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if sign:
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return _Dec_n1
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return _NegativeOne
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else:
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return _Dec_p1
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return _Dec_0
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return _One
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return _Zero
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def compare_total_mag(self, other):
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@ -2804,11 +2804,11 @@ class Decimal(object):
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# exp(-Infinity) = 0
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if self._isinfinity() == -1:
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return _Dec_0
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return _Zero
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# exp(0) = 1
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if not self:
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return _Dec_p1
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return _One
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# exp(Infinity) = Infinity
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if self._isinfinity() == 1:
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@ -2960,15 +2960,15 @@ class Decimal(object):
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# ln(0.0) == -Infinity
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if not self:
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return _negInf
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return _NegativeInfinity
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# ln(Infinity) = Infinity
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if self._isinfinity() == 1:
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return _Inf
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return _Infinity
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# ln(1.0) == 0.0
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if self == _Dec_p1:
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return _Dec_0
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if self == _One:
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return _Zero
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# ln(negative) raises InvalidOperation
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if self._sign == 1:
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@ -3040,11 +3040,11 @@ class Decimal(object):
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# log10(0.0) == -Infinity
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if not self:
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return _negInf
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return _NegativeInfinity
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# log10(Infinity) = Infinity
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if self._isinfinity() == 1:
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return _Inf
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return _Infinity
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# log10(negative or -Infinity) raises InvalidOperation
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if self._sign == 1:
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@ -3096,7 +3096,7 @@ class Decimal(object):
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# logb(+/-Inf) = +Inf
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if self._isinfinity():
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return _Inf
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return _Infinity
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# logb(0) = -Inf, DivisionByZero
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if not self:
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@ -3253,7 +3253,7 @@ class Decimal(object):
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return ans
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if self._isinfinity() == -1:
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return _negInf
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return _NegativeInfinity
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if self._isinfinity() == 1:
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return _dec_from_triple(0, '9'*context.prec, context.Etop())
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@ -3276,7 +3276,7 @@ class Decimal(object):
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return ans
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if self._isinfinity() == 1:
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return _Inf
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return _Infinity
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if self._isinfinity() == -1:
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return _dec_from_triple(1, '9'*context.prec, context.Etop())
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@ -5540,15 +5540,15 @@ def _format_align(body, spec_dict):
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##### Useful Constants (internal use only) ################################
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# Reusable defaults
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_Inf = Decimal('Inf')
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_negInf = Decimal('-Inf')
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_Infinity = Decimal('Inf')
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_NegativeInfinity = Decimal('-Inf')
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_NaN = Decimal('NaN')
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_Dec_0 = Decimal(0)
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_Dec_p1 = Decimal(1)
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_Dec_n1 = Decimal(-1)
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_Zero = Decimal(0)
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_One = Decimal(1)
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_NegativeOne = Decimal(-1)
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# _Infsign[sign] is infinity w/ that sign
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_Infsign = (_Inf, _negInf)
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# _SignedInfinity[sign] is infinity w/ that sign
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_SignedInfinity = (_Infinity, _NegativeInfinity)
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