Index: Modules/zipimport.c
===================================================================
--- Modules/zipimport.c	(revision 67511)
+++ Modules/zipimport.c	(working copy)
@@ -487,6 +487,42 @@
 	return Py_None;
 }
 
+static PyObject *
+zipimporter_get_filename(PyObject *obj, PyObject *args)
+{
+	ZipImporter *self = (ZipImporter *)obj;
+	PyObject *toc_entry;
+	char *fullname, *subname, path[MAXPATHLEN+1];
+	int len;
+	enum zi_module_info mi;
+
+	if (!PyArg_ParseTuple(args, "s:zipimporter.get_filename", &fullname))
+		return NULL;
+
+	mi = get_module_info(self, fullname);
+	if (mi == MI_ERROR)
+		return NULL;
+	if (mi == MI_NOT_FOUND) {
+		PyErr_Format(ZipImportError, "can't find module '%.200s'",
+			     fullname);
+		return NULL;
+	}
+	subname = get_subname(fullname);
+
+	len = make_filename(PyString_AsString(self->prefix), subname, path);
+	if (len < 0)
+		return NULL;
+
+	if (mi == MI_PACKAGE) {
+		path[len] = SEP;
+		strcpy(path + len + 1, "__init__.py");
+	}
+	else
+		strcpy(path + len, ".py");
+	return PyString_FromFormat("%s%c%s", PyString_AsString(self->archive),
+				   SEP, path);
+}
+
 PyDoc_STRVAR(doc_find_module,
 "find_module(fullname, path=None) -> self or None.\n\
 \n\
@@ -528,6 +564,12 @@
 is the module couldn't be found, return None if the archive does\n\
 contain the module, but has no source for it.");
 
+
+PyDoc_STRVAR(doc_get_filename,
+"get_filename(fullname) -> filename string.\n\
+\n\
+Return the filename for the specified module.");
+
 static PyMethodDef zipimporter_methods[] = {
 	{"find_module", zipimporter_find_module, METH_VARARGS,
 	 doc_find_module},
@@ -539,6 +581,8 @@
 	 doc_get_code},
 	{"get_source", zipimporter_get_source, METH_VARARGS,
 	 doc_get_source},
+	{"get_filename", zipimporter_get_filename, METH_VARARGS,
+	 doc_get_filename},
 	{"is_package", zipimporter_is_package, METH_VARARGS,
 	 doc_is_package},
 	{NULL,		NULL}	/* sentinel */
Index: Lib/test/test_zipimport.py
===================================================================
--- Lib/test/test_zipimport.py	(revision 67511)
+++ Lib/test/test_zipimport.py	(working copy)
@@ -224,6 +224,8 @@
             mod = __import__(module_path_to_dotted_name(mod_name))
             self.assertEquals(zi.get_source(TESTPACK), None)
             self.assertEquals(zi.get_source(mod_name), None)
+            path = os.path.join(TEMP_ZIP, mod_name + '.py')
+            self.assertEquals(zi.get_filename(mod_name), path)
 
             # test prefix and archivepath members
             zi2 = zipimport.zipimporter(TEMP_ZIP + os.sep + TESTPACK)