diff --git a/src/sage/features/csdp.py b/src/sage/features/csdp.py
index e8aa55e50ea..8f2e18dc182 100644
--- a/src/sage/features/csdp.py
+++ b/src/sage/features/csdp.py
@@ -59,7 +59,7 @@ def is_functional(self):
 
         tf_name = tmp_filename()
         with open(tf_name, 'wb') as tf:
-            tf.write("2\n1\n1 1".encode())
+            tf.write(b"2\n1\n1 1")
         with open(os.devnull, 'wb') as devnull:
             command = ['theta', tf_name]
             try:
diff --git a/src/sage/graphs/isgci.py b/src/sage/graphs/isgci.py
index 440135956c3..2315ea4679d 100644
--- a/src/sage/graphs/isgci.py
+++ b/src/sage/graphs/isgci.py
@@ -818,7 +818,7 @@ def _parse_db(self):
 
             sage: graph_classes._parse_db()
         """
-        import xml.etree.cElementTree as ET
+        import xml.etree.ElementTree as ET
         from sage.graphs.graph import Graph
 
         data_dir = os.path.dirname(DatabaseGraphs().absolute_filename())