Index: Python/sysmodule.c
===================================================================
--- Python/sysmodule.c	(Revision 59248)
+++ Python/sysmodule.c	(Arbeitskopie)
@@ -18,6 +18,7 @@
 #include "code.h"
 #include "frameobject.h"
 #include "eval.h"
+#include <float.h>
 
 #include "osdefs.h"
 
@@ -1045,7 +1046,37 @@
 	return shortbranch;
 }
 
+#define SET_FLOAT_CONST(d, key, const) \
+	tmp = PyFloat_FromDouble(const); \
+	if (tmp == NULL) return NULL; \
+	if (PyDict_SetItemString(d, key, tmp)) return NULL; \
+	Py_DECREF(tmp)
+#define SET_INT_CONST(d, key, const) \
+	tmp = PyInt_FromLong(const); \
+	if (tmp == NULL) return NULL; \
+	if (PyDict_SetItemString(d, key, tmp)) return NULL; \
+	Py_DECREF(tmp)
+
 PyObject *
+maxfloat(void)
+{
+	PyObject *d, *tmp;
+	d = PyDict_New();
+	SET_FLOAT_CONST(d, "max", DBL_MAX);
+	SET_INT_CONST(d, "max_exp", DBL_MAX_EXP);
+	SET_INT_CONST(d, "max_10_exp", DBL_MAX_10_EXP);
+	SET_FLOAT_CONST(d, "min", DBL_MIN);
+	SET_INT_CONST(d, "min_exp", DBL_MIN_EXP);
+	SET_INT_CONST(d, "min_10_exp", DBL_MIN_10_EXP);
+	SET_INT_CONST(d, "dig", DBL_DIG);
+	SET_INT_CONST(d, "mant_dig", DBL_MANT_DIG);
+	SET_FLOAT_CONST(d, "epsilon", DBL_EPSILON);
+	SET_INT_CONST(d, "radix", FLT_RADIX);
+	SET_INT_CONST(d, "rounds", FLT_ROUNDS);
+	return d;
+}
+
+PyObject *
 _PySys_Init(void)
 {
 	PyObject *m, *v, *sysdict;
@@ -1169,6 +1200,8 @@
 			    PyInt_FromLong(PyInt_GetMax()));
 	SET_SYS_FROM_STRING("py3kwarning",
 			    PyBool_FromLong(Py_Py3kWarningFlag));
+	SET_SYS_FROM_STRING("maxfloat",
+			    maxfloat());
 #ifdef Py_USING_UNICODE
 	SET_SYS_FROM_STRING("maxunicode",
 			    PyInt_FromLong(PyUnicode_GetMax()));