From 39b109a9ad55d7dcdbee00ed9f5c69ee57aabcd2 Mon Sep 17 00:00:00 2001
From: "M. Zulqarnain" <muhammad.zulqarnain@arbisoft.com>
Date: Wed, 24 Jun 2020 18:23:11 +0500
Subject: [PATCH] Fixed bad escape character (#24316)

As of Python 3.7, a backslash-character pair that is not a valid escape sequence now generates an error, earlier it was a deprecation warning.
---
 common/lib/symmath/symmath/formula.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/lib/symmath/symmath/formula.py b/common/lib/symmath/symmath/formula.py
index 355dbfd57d..e82d361d7c 100644
--- a/common/lib/symmath/symmath/formula.py
+++ b/common/lib/symmath/symmath/formula.py
@@ -84,7 +84,7 @@ def to_latex(expr):
     # sometimes get 'script(N)__B' or more complicated terms
     expr_s = re.sub(
         r'script([a-zA-Z0-9]+)',
-        '\\mathcal{\\1}',
+        r'\\mathcal{\\1}',
         expr_s
     )