From 74a92cf07ba76f3dd6814b754acac32a7cc85133 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Mon, 9 Sep 2019 14:46:53 -0500
Subject: [PATCH] Fix an isintance to be more lenient for Py2

---
 sumpy/assignment_collection.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sumpy/assignment_collection.py b/sumpy/assignment_collection.py
index 96d078a0..dadf3fc9 100644
--- a/sumpy/assignment_collection.py
+++ b/sumpy/assignment_collection.py
@@ -145,7 +145,7 @@ class SymbolicAssignmentCollection(object):
         return result
 
     def add_assignment(self, name, expr, root_name=None, wrt_set=None):
-        assert isinstance(name, str)
+        assert isinstance(name, six.string_types)
         assert name not in self.assignments
 
         if wrt_set is None:
-- 
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