diff --git a/Makefile b/Makefile
index ca6ca94..556c5b3 100644
--- a/Makefile
+++ b/Makefile
@@ -231,8 +231,8 @@ save_restore_test: $(POSIX)/ueforth
 sizes: $(ESP32_SIM)/Esp32forth-sim
 	echo internals size-all bye | $< | tools/memuse.py >$(ESP32_SIM)/sizes.txt
 
-sanity_test_web: $(WEB)/ueforth.js
-	echo '120 3 + . cr bye' | $(D8) $< | tools/check_web_sanity.js
+sanity_test_web: $(WEB)/ueforth.js tools/check_web_sanity.py
+	echo '120 3 + . cr bye' | $(D8) $< | ./tools/check_web_sanity.py
 
 # ---- GENERATED ----
 
diff --git a/tools/check_web_sanity.js b/tools/check_web_sanity.js
deleted file mode 100755
index 77838dd..0000000
--- a/tools/check_web_sanity.js
+++ /dev/null
@@ -1,31 +0,0 @@
-#! /usr/bin/env nodejs
-// Copyright 2022 Bradley D. Nelson
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-var fs = require('fs');
-var process = require('process');
-
-var source = fs.readFileSync('/dev/stdin').toString();
-
-if (source.match(/Invalid/)) {
-  console.log('BAD ASM.JS');
-  console.log(source);
-  process.exit(1)
-}
-
-if (!source.match(/[-][-][>] 123[ \r\n]+$/)) {
-  console.log('MISSING EXPECTED OUTPUT');
-  console.log(source);
-  process.exit(1)
-}
diff --git a/tools/check_web_sanity.py b/tools/check_web_sanity.py
new file mode 100755
index 0000000..72186a1
--- /dev/null
+++ b/tools/check_web_sanity.py
@@ -0,0 +1,29 @@
+#! /usr/bin/env python3
+# Copyright 2023 Bradley D. Nelson
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import re
+import sys
+
+source = sys.stdin.read()
+
+if 'Invalid' in source:
+  print('BAD ASM.JS')
+  print(source)
+  sys.exit(1)
+
+if not source.strip().endswith('--> 123'):
+  print('MISSING EXPECTED OUTPUT')
+  print(source)
+  sys.exit(1)
diff --git a/tools/importation.py b/tools/importation.py
index 3ead57c..7b66209 100755
--- a/tools/importation.py
+++ b/tools/importation.py
@@ -1,4 +1,17 @@
 #! /usr/bin/env python3
+# Copyright 2023 Bradley D. Nelson
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 import argparse
 import os
@@ -61,7 +74,7 @@ def Process():
   for line in results:
     for r in replacements:
       name, value = r.split('=', 1)
-      line = line.replace('{{' + name + 'VERSION}}', value)
+      line = line.replace('{{' + name + '}}', value)
     output.append(line)
   # Drop comments.
   comment1 = False
diff --git a/tools/memuse.py b/tools/memuse.py
index 568cf88..4b4a789 100755
--- a/tools/memuse.py
+++ b/tools/memuse.py
@@ -1,4 +1,17 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
+# Copyright 2023 Bradley D. Nelson
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 import sys