Implement PEP 238 in its (almost) full glory.

This introduces:

- A new operator // that means floor division (the kind of division
  where 1/2 is 0).

- The "future division" statement ("from __future__ import division)
  which changes the meaning of the / operator to implement "true
  division" (where 1/2 is 0.5).

- New overloadable operators __truediv__ and __floordiv__.

- New slots in the PyNumberMethods struct for true and floor division,
  new abstract APIs for them, new opcodes, and so on.

I emphasize that without the future division statement, the semantics
of / will remain unchanged until Python 3.0.

Not yet implemented are warnings (default off) when / is used with int
or long arguments.

This has been on display since 7/31 as SF patch #443474.

Flames to /dev/null.

1 files changed, 10 insertions, 0 deletions

diff --git a/Objects/intobject.c b/Objects/intobject.c
index e5106c5..f69f81a 100644
--- a/Objects/intobject.c
+++ b/Objects/intobject.c
@@ -703,6 +703,12 @@ int_or(PyIntObject *v, PyIntObject *w)
 }
 
 static PyObject *
+int_true_divide(PyObject *v, PyObject *w)
+{
+	return PyFloat_Type.tp_as_number->nb_divide(v, w);
+}
+
+static PyObject *
 int_int(PyIntObject *v)
 {
 	Py_INCREF(v);
@@ -812,6 +818,10 @@ static PyNumberMethods int_as_number = {
 	0,			/*nb_inplace_and*/
 	0,			/*nb_inplace_xor*/
 	0,			/*nb_inplace_or*/
+	(binaryfunc)int_div,	/* nb_floor_divide */
+	int_true_divide,	/* nb_true_divide */
+	0,			/* nb_inplace_floor_divide */
+	0,			/* nb_inplace_true_divide */
 };
 
 PyTypeObject PyInt_Type = {