Add constant.py.

Bug: 292453652
Test: ./parse_cts_report.py -r REPORT -d OUTPUT_DIR &&
  ./aggregate_cts_reports.py -r REPORT [REPORT ...] -d OUTPUT_DIR &&
  ./compare_cts_reports.py [-r CTS_REPORTS [CTS_REPORTS ...]] \
  [--folder CTS_REPORTS] --mode {1,2,n} --output-dir OUTPUT_DIR [--csv CSV] [--output-files]
Change-Id: I96a135feb84b8f5e4dad939500865a65c000351d

tools/compare_cts_reports/constant.py

@@ -0,0 +1,24 @@
+#!/usr/bin/python3
+#
+# Copyright (C) 2023 The Android Open Source Project
+#
+# 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.
+#
+"""Constants for development/tools/compare_cts_reports/."""
+
+
+VERSION = '1.0'
+
+NO_DATA = 'null'
+TESTED_ITEMS = 'tested_items'
+PASS_RATE = 'pass_rate'