diff --git a/Objects/abstract.c b/Objects/abstract.c
index 4c8ef83..830fe82 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -2142,7 +2142,7 @@
 	PyObject *bases;
 
 	if (__bases__ == NULL) {
-		__bases__ = PyString_FromString("__bases__");
+		__bases__ = PyString_InternFromString("__bases__");
 		if (__bases__ == NULL)
 			return NULL;
 	}
@@ -2220,7 +2220,7 @@
 	int retval = 0;
 
 	if (__class__ == NULL) {
-		__class__ = PyString_FromString("__class__");
+		__class__ = PyString_InternFromString("__class__");
 		if (__class__ == NULL)
 			return -1;
 	}
diff --git a/Objects/complexobject.c b/Objects/complexobject.c
index 03b80c8..4777ed1 100644
--- a/Objects/complexobject.c
+++ b/Objects/complexobject.c
@@ -261,14 +261,19 @@
 		return ((PyComplexObject *)op)->cval;
 	}
 	/* If not, use op's __complex__  method, if it exists */
-	
+
 	/* return -1 on failure */
 	cv.real = -1.;
 	cv.imag = 0.;
+
+	if (complex_str == NULL) {
+		if (!(complex_str = PyString_InternFromString("__complex__")))
+			return cv;
+	}
 	
 	if (PyInstance_Check(op)) {
 		/* this can go away in python 3000 */
-		if (PyObject_HasAttrString(op, "__complex__")) {
+		if (PyObject_HasAttr(op, complex_str)) {
 			newop = PyObject_CallMethod(op, "__complex__", NULL);
 			if (!newop)
 				return cv;
@@ -276,10 +281,6 @@
 		/* else try __float__ */
 	} else {
 		PyObject *complexfunc;
-		if (!complex_str) {
-			if (!(complex_str = PyString_FromString("__complex__")))
-				return cv;
-		}
 		complexfunc = _PyType_Lookup(op->ob_type, complex_str);
 		/* complexfunc is a borrowed reference */
 		if (complexfunc) {
diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index a5a42fc..eb05cda 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -1965,7 +1965,7 @@
 	assert(type != NULL && type->tp_alloc != NULL);
 
 	if (not_yet_string == NULL) {
-		not_yet_string = PyString_FromString("<uninitialized file>");
+		not_yet_string = PyString_InternFromString("<uninitialized file>");
 		if (not_yet_string == NULL)
 			return NULL;
 	}