Index: Lib/tokenize.py
===================================================================
--- Lib/tokenize.py	(révision 70478)
+++ Lib/tokenize.py	(copie de travail)
@@ -480,3 +480,13 @@
 # library that expect to be able to use tokenize with strings
 def generate_tokens(readline):
     return _tokenize(readline, None)
+
+def open_script(filename, mode='r'):
+    """
+    Open a Python source code file with the correct encoding.
+    Use detect_encoding() to read the cookie.
+    """
+    with open(filename, 'rb') as fp:
+        encoding, lines = detect_encoding(fp.readline)
+    return open(filename, mode, encoding=encoding)
+