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.
diff --git a/Include/compile.h b/Include/compile.h
index 89c5ba4..e5840af 100644
--- a/Include/compile.h
+++ b/Include/compile.h
@@ -41,6 +41,8 @@
effect, this passes on the "from __future__ import generators" state
in effect when the code block was compiled. */
#define CO_GENERATOR_ALLOWED 0x1000
+/* XXX Ditto for future division */
+#define CO_FUTURE_DIVISION 0x2000
extern DL_IMPORT(PyTypeObject) PyCode_Type;
@@ -64,6 +66,7 @@
int ff_last_lineno;
int ff_nested_scopes;
int ff_generators;
+ int ff_division;
} PyFutureFeatures;
DL_IMPORT(PyFutureFeatures *) PyNode_Future(struct _node *, char *);
@@ -76,6 +79,9 @@
#define GENERATORS_DEFAULT 0
#define FUTURE_GENERATORS "generators"
+#define DIVISION_DEFAULT 0
+#define FUTURE_DIVISION "division"
+
/* for internal use only */
#define _PyCode_GETCODEPTR(co, pp) \
((*(co)->co_code->ob_type->tp_as_buffer->bf_getreadbuffer) \