From eb0ff3f7d283da03418c4d622b826a0b9ec2a114 Mon Sep 17 00:00:00 2001
From: rdmontgomery <rick.montgomery@fluenceanalytics.com>
Date: Thu, 18 Oct 2018 09:02:57 -0400
Subject: [PATCH] CLN GH23204 remove "not" typo in assertion

---
 pandas/core/reshape/concat.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/reshape/concat.py b/pandas/core/reshape/concat.py
index 1c602a0af1ec1..aa380d95e5f36 100644
--- a/pandas/core/reshape/concat.py
+++ b/pandas/core/reshape/concat.py
@@ -446,7 +446,7 @@ def _get_new_axes(self):
                 new_axes[i] = self._get_comb_axis(i)
         else:
             if len(self.join_axes) != ndim - 1:
-                raise AssertionError("length of join_axes must not be equal "
+                raise AssertionError("length of join_axes must be equal "
                                      "to {length}".format(length=ndim - 1))
 
             # ufff...