From 1caeecaeec50b0f81ab2f9b197afb333b7a313de 2015-11-24 11:56:50
From: Min RK <benjaminrk@gmail.com>
Date: 2015-11-24 11:56:50
Subject: [PATCH] Backport PR #8985: override vformat instead of _vformat

in our eval formatters

avoids being caught out by changes in private API

this needs to be backported in order to support Python 3.4.4
...

---

diff --git a/IPython/utils/text.py b/IPython/utils/text.py
index 6cd9955..6f6d811 100644
--- a/IPython/utils/text.py
+++ b/IPython/utils/text.py
@@ -558,9 +558,7 @@ class FullEvalFormatter(Formatter):
     """
     # copied from Formatter._vformat with minor changes to allow eval
     # and replace the format_spec code with slicing
-    def _vformat(self, format_string, args, kwargs, used_args, recursion_depth):
-        if recursion_depth < 0:
-            raise ValueError('Max string recursion exceeded')
+    def vformat(self, format_string, args, kwargs):
         result = []
         for literal_text, field_name, format_spec, conversion in \
                 self.parse(format_string):