Replace backticks with repr() or "%r"
From SF patch #852334.
diff --git a/Lib/idlelib/ParenMatch.py b/Lib/idlelib/ParenMatch.py
index bd4e077..407f468 100644
--- a/Lib/idlelib/ParenMatch.py
+++ b/Lib/idlelib/ParenMatch.py
@@ -142,7 +142,7 @@
y = PyParse.Parser(self.indentwidth, self.tabwidth)
for context in self.num_context_lines:
startat = max(lno - context, 1)
- startatindex = `startat` + ".0"
+ startatindex = repr(startat) + ".0"
# rawtext needs to contain everything up to the last
# character, which was the close paren. the parser also
# requires that the last line ends with "\n"