Issue #25758: Prevents zipimport from unnecessarily encoding a filename (patch by Eryk Sun)

Lib/test/test_zipimport.py

@@ -615,7 +615,7 @@ class UncompressedZipImportTestCase(ImportHooksBaseTestCase):
         z.writestr(zinfo, test_src)
         z.close()
         try:
-            zipimport.zipimporter(filename)
+            zipimport.zipimporter(filename).load_module(TESTMOD)
         finally:
             os.remove(filename)
 

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.6.0 beta 1
 Core and Builtins
 -----------------
 
+- Issue #25758: Prevents zipimport from unnecessarily encoding a filename
+  (patch by Eryk Sun)
+
 - Issue #25856: The __module__ attribute of extension classes and functions
   now is interned. This leads to more compact pickle data with protocol 4.
 

Modules/zipimport.c

@@ -1362,22 +1362,16 @@ normalize_line_endings(PyObject *source)
 static PyObject *
 compile_source(PyObject *pathname, PyObject *source)
 {
-    PyObject *code, *fixed_source, *pathbytes;
-
-    pathbytes = PyUnicode_EncodeFSDefault(pathname);
-    if (pathbytes == NULL)
-        return NULL;
+    PyObject *code, *fixed_source;
 
     fixed_source = normalize_line_endings(source);
     if (fixed_source == NULL) {
-        Py_DECREF(pathbytes);
         return NULL;
     }
 
-    code = Py_CompileString(PyBytes_AsString(fixed_source),
-                            PyBytes_AsString(pathbytes),
-                            Py_file_input);
-    Py_DECREF(pathbytes);
+    code = Py_CompileStringObject(PyBytes_AsString(fixed_source),
+                                  pathname, Py_file_input, NULL, 1);
+
     Py_DECREF(fixed_source);
     return code;
 }