Removed the private _rounding_decision: it was not needed, and the code
is now simpler. Thanks Mark Dickinson.
This commit is contained in:
Facundo Batista
parent
d41b8dc58c
commit
e64acfad3d
132
Lib/decimal.py
132
Lib/decimal.py
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@ -146,10 +146,6 @@ ROUND_UP = 'ROUND_UP'
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ROUND_HALF_DOWN = 'ROUND_HALF_DOWN'
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ROUND_05UP = 'ROUND_05UP'
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# Rounding decision (not part of the public API)
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NEVER_ROUND = 'NEVER_ROUND' # Round in division (non-divmod), sqrt ONLY
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ALWAYS_ROUND = 'ALWAYS_ROUND' # Every operation rounds at end.
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# Errors
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class DecimalException(ArithmeticError):
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@ -911,9 +907,7 @@ class Decimal(object):
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if context is None:
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context = getcontext()
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if context._rounding_decision == ALWAYS_ROUND:
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return ans._fix(context)
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return ans
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return ans._fix(context)
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def __pos__(self, context=None):
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"""Returns a copy, unless it is a sNaN.
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@ -933,26 +927,23 @@ class Decimal(object):
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if context is None:
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context = getcontext()
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if context._rounding_decision == ALWAYS_ROUND:
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return ans._fix(context)
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return ans
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return ans._fix(context)
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def __abs__(self, round=1, context=None):
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def __abs__(self, round=True, context=None):
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"""Returns the absolute value of self.
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If the second argument is 0, do not round.
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If the keyword argument 'round' is false, do not round. The
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expression self.__abs__(round=False) is equivalent to
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self.copy_abs().
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"""
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if not round:
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return self.copy_abs()
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if self._is_special:
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ans = self._check_nans(context=context)
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if ans:
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return ans
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if not round:
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if context is None:
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context = getcontext()
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context = context._shallow_copy()
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context._set_rounding_decision(NEVER_ROUND)
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if self._sign:
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ans = self.__neg__(context=context)
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else:
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@ -985,8 +976,6 @@ class Decimal(object):
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if other._isinfinity():
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return Decimal(other) # Can't both be infinity here
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shouldround = context._rounding_decision == ALWAYS_ROUND
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exp = min(self._exp, other._exp)
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negativezero = 0
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if context.rounding == ROUND_FLOOR and self._sign != other._sign:
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@ -998,33 +987,29 @@ class Decimal(object):
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if negativezero:
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sign = 1
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ans = _dec_from_triple(sign, '0', exp)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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if not self:
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exp = max(exp, other._exp - context.prec-1)
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ans = other._rescale(exp, context.rounding)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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if not other:
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exp = max(exp, self._exp - context.prec-1)
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ans = self._rescale(exp, context.rounding)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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op1 = _WorkRep(self)
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op2 = _WorkRep(other)
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op1, op2 = _normalize(op1, op2, shouldround, context.prec)
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op1, op2 = _normalize(op1, op2, context.prec)
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result = _WorkRep()
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if op1.sign != op2.sign:
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# Equal and opposite
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if op1.int == op2.int:
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ans = _dec_from_triple(negativezero, '0', exp)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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if op1.int < op2.int:
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op1, op2 = op2, op1
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@ -1049,8 +1034,7 @@ class Decimal(object):
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result.exp = op1.exp
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ans = Decimal(result)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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__radd__ = __add__
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@ -1107,34 +1091,29 @@ class Decimal(object):
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return Infsign[resultsign]
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resultexp = self._exp + other._exp
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shouldround = context._rounding_decision == ALWAYS_ROUND
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# Special case for multiplying by zero
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if not self or not other:
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ans = _dec_from_triple(resultsign, '0', resultexp)
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if shouldround:
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# Fixing in case the exponent is out of bounds
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ans = ans._fix(context)
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# Fixing in case the exponent is out of bounds
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ans = ans._fix(context)
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return ans
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# Special case for multiplying by power of 10
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if self._int == '1':
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ans = _dec_from_triple(resultsign, other._int, resultexp)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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if other._int == '1':
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ans = _dec_from_triple(resultsign, self._int, resultexp)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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op1 = _WorkRep(self)
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op2 = _WorkRep(other)
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ans = _dec_from_triple(resultsign, str(op1.int * op2.int), resultexp)
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if shouldround:
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ans = ans._fix(context)
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ans = ans._fix(context)
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return ans
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__rmul__ = __mul__
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@ -1274,8 +1253,7 @@ class Decimal(object):
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context._raise_error(InvalidOperation, 'x % 0'))
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quotient, remainder = self._divide(other, context)
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if context._rounding_decision == ALWAYS_ROUND:
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remainder = remainder._fix(context)
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remainder = remainder._fix(context)
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return quotient, remainder
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def __rdivmod__(self, other, context=None):
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@ -1309,8 +1287,7 @@ class Decimal(object):
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return context._raise_error(DivisionUndefined, '0 % 0')
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remainder = self._divide(other, context)[1]
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if context._rounding_decision == ALWAYS_ROUND:
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remainder = remainder._fix(context)
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remainder = remainder._fix(context)
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return remainder
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def __rmod__(self, other, context=None):
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@ -2487,9 +2464,7 @@ class Decimal(object):
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else:
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ans = self
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if context._rounding_decision == ALWAYS_ROUND:
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return ans._fix(context)
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return ans
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return ans._fix(context)
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def min(self, other, context=None):
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"""Returns the smaller value.
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@ -2523,9 +2498,7 @@ class Decimal(object):
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else:
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ans = other
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if context._rounding_decision == ALWAYS_ROUND:
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return ans._fix(context)
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return ans
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return ans._fix(context)
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def _isinteger(self):
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"""Returns whether self is an integer"""
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@ -3096,9 +3069,7 @@ class Decimal(object):
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else:
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ans = self
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if context._rounding_decision == ALWAYS_ROUND:
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return ans._fix(context)
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return ans
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return ans._fix(context)
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def min_mag(self, other, context=None):
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"""Compares the values numerically with their sign ignored."""
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@ -3128,9 +3099,7 @@ class Decimal(object):
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else:
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ans = other
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if context._rounding_decision == ALWAYS_ROUND:
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return ans._fix(context)
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return ans
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return ans._fix(context)
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def next_minus(self, context=None):
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"""Returns the largest representable number smaller than itself."""
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@ -3423,7 +3392,6 @@ class Context(object):
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Contains:
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prec - precision (for use in rounding, division, square roots..)
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rounding - rounding type (how you round)
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_rounding_decision - ALWAYS_ROUND, NEVER_ROUND -- do you round?
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traps - If traps[exception] = 1, then the exception is
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raised when it is caused. Otherwise, a value is
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substituted in.
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@ -3439,7 +3407,6 @@ class Context(object):
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def __init__(self, prec=None, rounding=None,
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traps=None, flags=None,
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_rounding_decision=None,
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Emin=None, Emax=None,
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capitals=None, _clamp=0,
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_ignored_flags=None):
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@ -3479,16 +3446,16 @@ class Context(object):
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def _shallow_copy(self):
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"""Returns a shallow copy from self."""
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nc = Context(self.prec, self.rounding, self.traps, self.flags,
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self._rounding_decision, self.Emin, self.Emax,
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self.capitals, self._clamp, self._ignored_flags)
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nc = Context(self.prec, self.rounding, self.traps,
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self.flags, self.Emin, self.Emax,
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self.capitals, self._clamp, self._ignored_flags)
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return nc
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def copy(self):
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"""Returns a deep copy from self."""
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nc = Context(self.prec, self.rounding, self.traps.copy(),
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self.flags.copy(), self._rounding_decision, self.Emin,
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self.Emax, self.capitals, self._clamp, self._ignored_flags)
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self.flags.copy(), self.Emin, self.Emax,
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self.capitals, self._clamp, self._ignored_flags)
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return nc
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__copy__ = copy
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@ -3545,27 +3512,6 @@ class Context(object):
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"""Returns maximum exponent (= Emax - prec + 1)"""
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return int(self.Emax - self.prec + 1)
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def _set_rounding_decision(self, type):
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"""Sets the rounding decision.
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Sets the rounding decision, and returns the current (previous)
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rounding decision. Often used like:
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context = context._shallow_copy()
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# That so you don't change the calling context
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# if an error occurs in the middle (say DivisionImpossible is raised).
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rounding = context._set_rounding_decision(NEVER_ROUND)
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instance = instance / Decimal(2)
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context._set_rounding_decision(rounding)
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This will make it not round for that operation.
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"""
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rounding = self._rounding_decision
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self._rounding_decision = type
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return rounding
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def _set_rounding(self, type):
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"""Sets the rounding type.
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@ -4753,7 +4699,7 @@ class _WorkRep(object):
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def _normalize(op1, op2, shouldround = 0, prec = 0):
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def _normalize(op1, op2, prec = 0):
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"""Normalizes op1, op2 to have the same exp and length of coefficient.
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Done during addition.
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@ -4770,13 +4716,12 @@ def _normalize(op1, op2, shouldround = 0, prec = 0):
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# as adding any positive quantity smaller than 10**exp; similarly
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# for subtraction. So if other is smaller than 10**exp we replace
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# it with 10**exp. This avoids tmp.exp - other.exp getting too large.
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if shouldround:
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tmp_len = len(str(tmp.int))
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other_len = len(str(other.int))
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exp = tmp.exp + min(-1, tmp_len - prec - 2)
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if other_len + other.exp - 1 < exp:
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other.int = 1
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other.exp = exp
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tmp_len = len(str(tmp.int))
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other_len = len(str(other.int))
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exp = tmp.exp + min(-1, tmp_len - prec - 2)
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if other_len + other.exp - 1 < exp:
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other.int = 1
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other.exp = exp
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tmp.int *= 10 ** (tmp.exp - other.exp)
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tmp.exp = other.exp
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@ -5144,7 +5089,6 @@ DefaultContext = Context(
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prec=28, rounding=ROUND_HALF_EVEN,
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traps=[DivisionByZero, Overflow, InvalidOperation],
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flags=[],
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_rounding_decision=ALWAYS_ROUND,
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Emax=999999999,
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Emin=-999999999,
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capitals=1
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