Register decimals as numbers.Number

git-svn-id: http://svn.python.org/projects/python/trunk@69242 6015fed2-1504-0410-9fe1-9d1591cc4771

Author: raymond.hettinger

Lib/decimal.py

@@ -136,6 +136,7 @@
 
 import copy as _copy
 import math as _math
+import numbers as _numbers
 
 try:
     from collections import namedtuple as _namedtuple
@@ -3608,6 +3609,12 @@ def _dec_from_triple(sign, coefficient, exponent, special=False):
 
     return self
 
+# Register Decimal as a kind of Number (an abstract base class).
+# However, do not register it as Real (because Decimals are not
+# interoperable with floats).
+_numbers.Number.register(Decimal)
+
+
 ##### Context class #######################################################
 
 

Lib/test/test_decimal.py

@@ -30,6 +30,7 @@
 import pickle, copy
 import unittest
 from decimal import *
+import numbers
 from test.test_support import (TestSkipped, run_unittest, run_doctest,
                                is_resource_enabled)
 import random
@@ -1334,6 +1335,12 @@ def test_implicit_context(self):
 
 class DecimalPythonAPItests(unittest.TestCase):
 
+    def test_abc(self):
+        self.assert_(issubclass(Decimal, numbers.Number))
+        self.assert_(not issubclass(Decimal, numbers.Real))
+        self.assert_(isinstance(Decimal(0), numbers.Number))
+        self.assert_(not isinstance(Decimal(0), numbers.Real))
+
     def test_pickle(self):
         d = Decimal('-3.141590000')
         p = pickle.dumps(d)