sf #1009373, #1005936. fix underscores in index entries in PDF files.

I couldn't test this, but it didn't break anything and the patch
reported fixed the problem.

Bugfix candidate.

Doc/texinputs/python.sty

@@ -72,6 +72,7 @@
     \py@OldContentsline{#1}{\py@linkToName{page\my@pageno}{#2}}{#3}%
   }
   \AtEndDocument{
+    \def\_{\string_}
     \InputIfFileExists{\jobname.bkm}{\pdfcatalog{/PageMode /UseOutlines}}{}
   }
   \newcommand{\py@target}[1]{%

Misc/NEWS

@@ -140,9 +140,12 @@ C API
 Documentation
 -------------
 
-- bug #990669: os.path.normpath may alter the meaning of a path if it contains
-symbolic links. This has been documented in a comment since 1992, but is now in
-the library reference as well.
+- patch #1005936, bug #1009373: fix index entries which contain
+  an underscore when viewed with Acrobat.
+
+- bug #990669: os.path.normpath may alter the meaning of a path if
+  it contains symbolic links. This has been documented in a comment
+  since 1992, but is now in the library reference as well.
 
 New platforms
 -------------