From a2c830abed936e42424aad025b6d44bd82bb7750 Mon Sep 17 00:00:00 2001
From: Alexandru Fikl <alexfikl@gmail.com>
Date: Sun, 8 May 2022 15:23:06 -0500
Subject: [PATCH] use unicode in DirectionalDerivative.__str__

---
 sumpy/kernel.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sumpy/kernel.py b/sumpy/kernel.py
index d307e6aa..ccc30bcc 100644
--- a/sumpy/kernel.py
+++ b/sumpy/kernel.py
@@ -1091,8 +1091,10 @@ class DirectionalDerivative(DerivativeBase):
             dir_vec_name=self.dir_vec_name)
 
     def __str__(self):
-        return r"{} . \/_{} {}".format(
-                self.dir_vec_name, self.directional_kind[0], self.inner_kernel)
+        return r"{}·∇_{} {}".format(
+                self.dir_vec_name,
+                "y" if self.directional_kind == "src" else "x",
+                self.inner_kernel)
 
     def __repr__(self):
         return "{}({!r}, {})".format(
-- 
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