[Python-3000-checkins] r59390 - python/branches/py3k/Lib/numbers.py
guido.van.rossum
python-3000-checkins at python.org
Thu Dec 6 18:45:33 CET 2007
Author: guido.van.rossum
Date: Thu Dec 6 18:45:33 2007
New Revision: 59390
Modified:
python/branches/py3k/Lib/numbers.py
Log:
Small set of updates (with Jeffrey's OK).
Modified: python/branches/py3k/Lib/numbers.py
==============================================================================
--- python/branches/py3k/Lib/numbers.py (original)
+++ python/branches/py3k/Lib/numbers.py Thu Dec 6 18:45:33 2007
@@ -43,6 +43,7 @@
Inexact.register(complex)
Inexact.register(float)
+# Inexact.register(decimal.Decimal)
class Complex(Number):
@@ -97,7 +98,7 @@
def __pos__(self):
"""+self"""
- return self
+ raise NotImplementedError
def __sub__(self, other):
"""self - other"""
@@ -119,7 +120,7 @@
@abstractmethod
def __div__(self, other):
- """self / other"""
+ """self / other; should promote to float or complex when necessary."""
raise NotImplementedError
@abstractmethod
@@ -129,7 +130,7 @@
@abstractmethod
def __pow__(self, exponent):
- """Like division, self**exponent should promote to complex when necessary."""
+ """self**exponent; should promote to float or complex when necessary."""
raise NotImplementedError
@abstractmethod
@@ -152,9 +153,7 @@
"""self == other"""
raise NotImplementedError
- def __ne__(self, other):
- """self != other"""
- return not (self == other)
+ # __ne__ is inherited from object and negates whatever __eq__ does.
Complex.register(complex)
@@ -180,8 +179,30 @@
"""trunc(self): Truncates self to an Integral.
Returns an Integral i such that:
- * i>0 iff self>0
- * abs(i) <= abs(self).
+ * i>0 iff self>0;
+ * abs(i) <= abs(self);
+ * for any Integral j satisfying the first two conditions,
+ abs(i) >= abs(j) [i.e. i has "maximal" abs among those].
+ i.e. "truncate towards 0".
+ """
+ raise NotImplementedError
+
+ @abstractmethod
+ def __floor__(self):
+ """Finds the greatest Integral <= self."""
+ raise NotImplementedError
+
+ @abstractmethod
+ def __ceil__(self):
+ """Finds the least Integral >= self."""
+ raise NotImplementedError
+
+ @abstractmethod
+ def __round__(self, ndigits:"Integral"=None):
+ """Rounds self to ndigits decimal places, defaulting to 0.
+
+ If ndigits is omitted or None, returns an Integral, otherwise
+ returns a Real. Rounds half toward even.
"""
raise NotImplementedError
@@ -241,7 +262,7 @@
@property
def real(self):
"""Real numbers are their real component."""
- return self
+ return +self
@property
def imag(self):
@@ -250,9 +271,10 @@
def conjugate(self):
"""Conjugate is a no-op for Reals."""
- return self
+ return +self
Real.register(float)
+# Real.register(decimal.Decimal)
class Rational(Real, Exact):
@@ -358,7 +380,7 @@
@property
def numerator(self):
"""Integers are their own numerators."""
- return self
+ return +self
@property
def denominator(self):
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