mirror of
https://github.com/python/cpython.git
synced 2025-07-28 13:44:43 +00:00
Made the various is_* operations return booleans. This was discussed
with Cawlishaw by mail, and he basically confirmed that to these is_* operations, there's no need to return Decimal(0) and Decimal(1) if the language supports the False and True booleans. Also added a few tests for the these functions in extra.decTest, since they are mostly untested (apart from the doctests). Thanks Mark Dickinson
This commit is contained in:
Facundo Batista
parent
31ba8480d8
commit
1a191df14d
3 changed files with 2240 additions and 125 deletions
207
Lib/decimal.py
207
Lib/decimal.py
|
|
@ -679,14 +679,11 @@ class Decimal(object):
|
|||
return 0
|
||||
|
||||
def __nonzero__(self):
|
||||
"""Is the number non-zero?
|
||||
"""Return True if self is nonzero; otherwise return False.
|
||||
|
||||
0 if self == 0
|
||||
1 if self != 0
|
||||
NaNs and infinities are considered nonzero.
|
||||
"""
|
||||
if self._is_special:
|
||||
return True
|
||||
return sum(self._int) != 0
|
||||
return self._is_special or self._int[0] != 0
|
||||
|
||||
def __cmp__(self, other):
|
||||
other = _convert_other(other)
|
||||
|
|
@ -2239,15 +2236,18 @@ class Decimal(object):
|
|||
return ans
|
||||
|
||||
def same_quantum(self, other):
|
||||
"""Test whether self and other have the same exponent.
|
||||
"""Return True if self and other have the same exponent; otherwise
|
||||
return False.
|
||||
|
||||
same as self._exp == other._exp, except NaN == sNaN
|
||||
If either operand is a special value, the following rules are used:
|
||||
* return True if both operands are infinities
|
||||
* return True if both operands are NaNs
|
||||
* otherwise, return False.
|
||||
"""
|
||||
other = _convert_other(other, raiseit=True)
|
||||
if self._is_special or other._is_special:
|
||||
if self._isnan() or other._isnan():
|
||||
return self._isnan() and other._isnan() and True
|
||||
if self._isinfinity() or other._isinfinity():
|
||||
return self._isinfinity() and other._isinfinity() and True
|
||||
return (self.is_nan() and other.is_nan() or
|
||||
self.is_infinite() and other.is_infinite())
|
||||
return self._exp == other._exp
|
||||
|
||||
def _rescale(self, exp, rounding):
|
||||
|
|
@ -2730,84 +2730,60 @@ class Decimal(object):
|
|||
return ans
|
||||
|
||||
def is_canonical(self):
|
||||
"""Returns 1 if self is canonical; otherwise returns 0."""
|
||||
return Dec_p1
|
||||
"""Return True if self is canonical; otherwise return False.
|
||||
|
||||
Currently, the encoding of a Decimal instance is always
|
||||
canonical, so this method returns True for any Decimal.
|
||||
"""
|
||||
return True
|
||||
|
||||
def is_finite(self):
|
||||
"""Returns 1 if self is finite, otherwise returns 0.
|
||||
"""Return True if self is finite; otherwise return False.
|
||||
|
||||
For it to be finite, it must be neither infinite nor a NaN.
|
||||
A Decimal instance is considered finite if it is neither
|
||||
infinite nor a NaN.
|
||||
"""
|
||||
if self._is_special:
|
||||
return Dec_0
|
||||
else:
|
||||
return Dec_p1
|
||||
return not self._is_special
|
||||
|
||||
def is_infinite(self):
|
||||
"""Returns 1 if self is an Infinite, otherwise returns 0."""
|
||||
if self._isinfinity():
|
||||
return Dec_p1
|
||||
else:
|
||||
return Dec_0
|
||||
"""Return True if self is infinite; otherwise return False."""
|
||||
return self._exp == 'F'
|
||||
|
||||
def is_nan(self):
|
||||
"""Returns 1 if self is qNaN or sNaN, otherwise returns 0."""
|
||||
if self._isnan():
|
||||
return Dec_p1
|
||||
else:
|
||||
return Dec_0
|
||||
"""Return True if self is a qNaN or sNaN; otherwise return False."""
|
||||
return self._exp in ('n', 'N')
|
||||
|
||||
def is_normal(self, context=None):
|
||||
"""Returns 1 if self is a normal number, otherwise returns 0."""
|
||||
if self._is_special:
|
||||
return Dec_0
|
||||
if not self:
|
||||
return Dec_0
|
||||
"""Return True if self is a normal number; otherwise return False."""
|
||||
if self._is_special or not self:
|
||||
return False
|
||||
if context is None:
|
||||
context = getcontext()
|
||||
if context.Emin <= self.adjusted() <= context.Emax:
|
||||
return Dec_p1
|
||||
else:
|
||||
return Dec_0
|
||||
return context.Emin <= self.adjusted() <= context.Emax
|
||||
|
||||
def is_qnan(self):
|
||||
"""Returns 1 if self is a quiet NaN, otherwise returns 0."""
|
||||
if self._isnan() == 1:
|
||||
return Dec_p1
|
||||
else:
|
||||
return Dec_0
|
||||
"""Return True if self is a quiet NaN; otherwise return False."""
|
||||
return self._exp == 'n'
|
||||
|
||||
def is_signed(self):
|
||||
"""Returns 1 if self is negative, otherwise returns 0."""
|
||||
return Decimal(self._sign)
|
||||
"""Return True if self is negative; otherwise return False."""
|
||||
return self._sign == 1
|
||||
|
||||
def is_snan(self):
|
||||
"""Returns 1 if self is a signaling NaN, otherwise returns 0."""
|
||||
if self._isnan() == 2:
|
||||
return Dec_p1
|
||||
else:
|
||||
return Dec_0
|
||||
"""Return True if self is a signaling NaN; otherwise return False."""
|
||||
return self._exp == 'N'
|
||||
|
||||
def is_subnormal(self, context=None):
|
||||
"""Returns 1 if self is subnormal, otherwise returns 0."""
|
||||
if self._is_special:
|
||||
return Dec_0
|
||||
if not self:
|
||||
return Dec_0
|
||||
"""Return True if self is subnormal; otherwise return False."""
|
||||
if self._is_special or not self:
|
||||
return False
|
||||
if context is None:
|
||||
context = getcontext()
|
||||
|
||||
r = self._exp + len(self._int)
|
||||
if r <= context.Emin:
|
||||
return Dec_p1
|
||||
return Dec_0
|
||||
return self.adjusted() < context.Emin
|
||||
|
||||
def is_zero(self):
|
||||
"""Returns 1 if self is a zero, otherwise returns 0."""
|
||||
if self:
|
||||
return Dec_0
|
||||
else:
|
||||
return Dec_p1
|
||||
"""Return True if self is a zero; otherwise return False."""
|
||||
return not self._is_special and self._int[0] == 0
|
||||
|
||||
def _ln_exp_bound(self):
|
||||
"""Compute a lower bound for the adjusted exponent of self.ln().
|
||||
|
|
@ -3871,138 +3847,145 @@ class Context(object):
|
|||
return a.fma(b, c, context=self)
|
||||
|
||||
def is_canonical(self, a):
|
||||
"""Returns 1 if the operand is canonical; otherwise returns 0.
|
||||
"""Return True if the operand is canonical; otherwise return False.
|
||||
|
||||
Currently, the encoding of a Decimal instance is always
|
||||
canonical, so this method returns True for any Decimal.
|
||||
|
||||
>>> ExtendedContext.is_canonical(Decimal('2.50'))
|
||||
Decimal("1")
|
||||
True
|
||||
"""
|
||||
return Dec_p1
|
||||
return a.is_canonical()
|
||||
|
||||
def is_finite(self, a):
|
||||
"""Returns 1 if the operand is finite, otherwise returns 0.
|
||||
"""Return True if the operand is finite; otherwise return False.
|
||||
|
||||
For it to be finite, it must be neither infinite nor a NaN.
|
||||
A Decimal instance is considered finite if it is neither
|
||||
infinite nor a NaN.
|
||||
|
||||
>>> ExtendedContext.is_finite(Decimal('2.50'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_finite(Decimal('-0.3'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_finite(Decimal('0'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_finite(Decimal('Inf'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_finite(Decimal('NaN'))
|
||||
Decimal("0")
|
||||
False
|
||||
"""
|
||||
return a.is_finite()
|
||||
|
||||
def is_infinite(self, a):
|
||||
"""Returns 1 if the operand is an Infinite, otherwise returns 0.
|
||||
"""Return True if the operand is infinite; otherwise return False.
|
||||
|
||||
>>> ExtendedContext.is_infinite(Decimal('2.50'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_infinite(Decimal('-Inf'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_infinite(Decimal('NaN'))
|
||||
Decimal("0")
|
||||
False
|
||||
"""
|
||||
return a.is_infinite()
|
||||
|
||||
def is_nan(self, a):
|
||||
"""Returns 1 if the operand is qNaN or sNaN, otherwise returns 0.
|
||||
"""Return True if the operand is a qNaN or sNaN;
|
||||
otherwise return False.
|
||||
|
||||
>>> ExtendedContext.is_nan(Decimal('2.50'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_nan(Decimal('NaN'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_nan(Decimal('-sNaN'))
|
||||
Decimal("1")
|
||||
True
|
||||
"""
|
||||
return a.is_nan()
|
||||
|
||||
def is_normal(self, a):
|
||||
"""Returns 1 if the operand is a normal number, otherwise returns 0.
|
||||
"""Return True if the operand is a normal number;
|
||||
otherwise return False.
|
||||
|
||||
>>> c = ExtendedContext.copy()
|
||||
>>> c.Emin = -999
|
||||
>>> c.Emax = 999
|
||||
>>> c.is_normal(Decimal('2.50'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> c.is_normal(Decimal('0.1E-999'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> c.is_normal(Decimal('0.00'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> c.is_normal(Decimal('-Inf'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> c.is_normal(Decimal('NaN'))
|
||||
Decimal("0")
|
||||
False
|
||||
"""
|
||||
return a.is_normal(context=self)
|
||||
|
||||
def is_qnan(self, a):
|
||||
"""Returns 1 if the operand is a quiet NaN, otherwise returns 0.
|
||||
"""Return True if the operand is a quiet NaN; otherwise return False.
|
||||
|
||||
>>> ExtendedContext.is_qnan(Decimal('2.50'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_qnan(Decimal('NaN'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_qnan(Decimal('sNaN'))
|
||||
Decimal("0")
|
||||
False
|
||||
"""
|
||||
return a.is_qnan()
|
||||
|
||||
def is_signed(self, a):
|
||||
"""Returns 1 if the operand is negative, otherwise returns 0.
|
||||
"""Return True if the operand is negative; otherwise return False.
|
||||
|
||||
>>> ExtendedContext.is_signed(Decimal('2.50'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_signed(Decimal('-12'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_signed(Decimal('-0'))
|
||||
Decimal("1")
|
||||
True
|
||||
"""
|
||||
return a.is_signed()
|
||||
|
||||
def is_snan(self, a):
|
||||
"""Returns 1 if the operand is a signaling NaN, otherwise returns 0.
|
||||
"""Return True if the operand is a signaling NaN;
|
||||
otherwise return False.
|
||||
|
||||
>>> ExtendedContext.is_snan(Decimal('2.50'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_snan(Decimal('NaN'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_snan(Decimal('sNaN'))
|
||||
Decimal("1")
|
||||
True
|
||||
"""
|
||||
return a.is_snan()
|
||||
|
||||
def is_subnormal(self, a):
|
||||
"""Returns 1 if the operand is subnormal, otherwise returns 0.
|
||||
"""Return True if the operand is subnormal; otherwise return False.
|
||||
|
||||
>>> c = ExtendedContext.copy()
|
||||
>>> c.Emin = -999
|
||||
>>> c.Emax = 999
|
||||
>>> c.is_subnormal(Decimal('2.50'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> c.is_subnormal(Decimal('0.1E-999'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> c.is_subnormal(Decimal('0.00'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> c.is_subnormal(Decimal('-Inf'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> c.is_subnormal(Decimal('NaN'))
|
||||
Decimal("0")
|
||||
False
|
||||
"""
|
||||
return a.is_subnormal(context=self)
|
||||
|
||||
def is_zero(self, a):
|
||||
"""Returns 1 if the operand is a zero, otherwise returns 0.
|
||||
"""Return True if the operand is a zero; otherwise return False.
|
||||
|
||||
>>> ExtendedContext.is_zero(Decimal('0'))
|
||||
Decimal("1")
|
||||
True
|
||||
>>> ExtendedContext.is_zero(Decimal('2.50'))
|
||||
Decimal("0")
|
||||
False
|
||||
>>> ExtendedContext.is_zero(Decimal('-0E+2'))
|
||||
Decimal("1")
|
||||
True
|
||||
"""
|
||||
return a.is_zero()
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue