Sphinx/create_identifiers: use `not in` not `not _ in`
diff --git a/Utilities/Sphinx/create_identifiers.py b/Utilities/Sphinx/create_identifiers.py
index 120b63d..f3dbbcc 100755
--- a/Utilities/Sphinx/create_identifiers.py
+++ b/Utilities/Sphinx/create_identifiers.py
@@ -38,7 +38,7 @@
for domain_object_string, domain_object_type in mapping:
if "<keyword name=\"" + domain_object_string + "\"" in line:
- if not "id=\"" in line and not "#index-" in line:
+ if "id=\"" not in line and "#index-" not in line:
prefix = "<keyword name=\"" + domain_object_string + "\" "
part1, part2 = line.split(prefix)
head, tail = part2.split("#" + domain_object_type + ":")