Issue #8774: tabnanny uses the encoding cookie (#coding:...) to use the correct

encoding

Lib/tabnanny.py

@@ -93,8 +93,11 @@ def check(file):
                 check(fullname)
         return
 
+    with open(file, 'rb') as f:
+        encoding, lines = tokenize.detect_encoding(f.readline)
+
     try:
-        f = open(file)
+        f = open(file, encoding=encoding)
     except IOError as msg:
         errprint("%r: I/O Error: %s" % (file, msg))
         return

Misc/NEWS

@@ -375,6 +375,9 @@ C-API
 Library
 -------
 
+- Issue #8774: tabnanny uses the encoding cookie (#coding:...) to use the
+  correct encoding
+
 - Issue #4870: Add an `options` attribute to SSL contexts, as well as
   several ``OP_*`` constants to the `ssl` module.  This allows to selectively
   disable protocol versions, when used in combination with `PROTOCOL_SSLv23`.