Issue #26581: Use the first coding cookie on a line, not the last one.

Lib/idlelib/IOBinding.py

@@ -65,7 +65,7 @@ else:
 
 encoding = encoding.lower()
 
-coding_re = re.compile(r'^[ \t\f]*#.*coding[:=][ \t]*([-\w.]+)')
+coding_re = re.compile(r'^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)')
 blank_re = re.compile(r'^[ \t\f]*(?:[#\r\n]|$)')
 
 class EncodingMessage(SimpleDialog):

Lib/lib2to3/pgen2/tokenize.py

@@ -236,7 +236,7 @@ class Untokenizer:
                 startline = False
             toks_append(tokval)
 
-cookie_re = re.compile(r'^[ \t\f]*#.*coding[:=][ \t]*([-\w.]+)')
+cookie_re = re.compile(r'^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)')
 blank_re = re.compile(r'^[ \t\f]*(?:[#\r\n]|$)')
 
 def _get_normal_name(orig_enc):

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 2.7.12?
 Core and Builtins
 -----------------
 
+- Issue #26581: If coding cookie is specified multiple times on a line in
+  Python source code file, only the first one is taken to account.
+
 - Issue #22836: Ensure exception reports from PyErr_Display() and
   PyErr_WriteUnraisable() are sensible even when formatting them produces
   secondary errors.  This affects the reports produced by

Tools/scripts/findnocoding.py

@@ -32,7 +32,7 @@ except ImportError:
                          "no sophisticated Python source file search will be done.")
 
 
-decl_re = re.compile(r'^[ \t\f]*#.*coding[:=][ \t]*([-\w.]+)')
+decl_re = re.compile(r'^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)')
 blank_re = re.compile(r'^[ \t\f]*(?:[#\r\n]|$)')
 
 def get_declaration(line):