Issue #12451: runpy: run_path() now opens the Python script in binary mode,

instead of text mode using the locale encoding, to support other encodings than
UTF-8 (scripts using the coding cookie).

Lib/runpy.py

@@ -226,7 +226,7 @@ def _get_code_from_file(fname):
         code = read_code(f)
     if code is None:
         # That didn't work, so try it as normal source code
-        with open(fname, "rU") as f:
+        with open(fname, "rb") as f:
             code = compile(f.read(), fname, 'exec')
     return code
 

Lib/test/test_runpy.py

@@ -405,6 +405,16 @@ def test_main_recursion_error(self):
             msg = "recursion depth exceeded"
             self.assertRaisesRegex(RuntimeError, msg, run_path, zip_name)
 
+    def test_encoding(self):
+        with temp_dir() as script_dir:
+            filename = os.path.join(script_dir, 'script.py')
+            with open(filename, 'w', encoding='latin1') as f:
+                f.write("""
+#coding:latin1
+"non-ASCII: h\xe9"
+""")
+            result = run_path(filename)
+            self.assertEqual(result['__doc__'], "non-ASCII: h\xe9")
 
 
 def test_main():

Misc/NEWS

@@ -19,6 +19,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #12451: runpy: run_path() now opens the Python script in binary mode,
+  instead of text mode using the locale encoding, to support other encodings
+  than UTF-8 (scripts using the coding cookie).
+
 - Issue #12451: xml.dom.pulldom: parse() now opens files in binary mode instead
   of the text mode (using the locale encoding) to avoid encoding issues.