Add new compatibility layer for Python 2 and 3 #295

This module used in condition to apply on Python 2 and Python 3

Signed-off-by: Abhishek Kumar <abhishek.kasyap09@gmail.com>

Author: Abhishek-Dev09

src/commoncode/compat.py

@@ -0,0 +1,47 @@
+#
+# Copyright (c) 2019 nexB Inc. and others. All rights reserved.
+# http://nexb.com and https://github.com/nexB/scancode-toolkit/
+# The ScanCode software is licensed under the Apache License version 2.0.
+# Data generated with ScanCode require an acknowledgment.
+# ScanCode is a trademark of nexB Inc.
+#
+# You may not use this software except in compliance with the License.
+# You may obtain a copy of the License at: http://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.
+#
+# When you publish or redistribute any data created with ScanCode or any ScanCode
+# derivative work, you must accompany this data with the following acknowledgment:
+#
+#  Generated with ScanCode and provided on an "AS IS" BASIS, WITHOUT WARRANTIES
+#  OR CONDITIONS OF ANY KIND, either express or implied. No content created from
+#  ScanCode should be considered or used as legal advice. Consult an Attorney
+#  for any legal advice.
+#  ScanCode is a free software code scanning tool from nexB Inc. and others.
+#  Visit https://github.com/nexB/scancode-toolkit/ for support and download.
+
+ from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+ try:
+    # Python 2
+    unicode = unicode  # NOQA
+
+ except NameError:  # pragma: nocover
+    # Python 3
+    unicode = str  # NOQA
+
+ string_types = str, bytes, unicode,
+
+ try:
+    # Python 2
+    long = long  # NOQA
+
+ except NameError:  # pragma: nocover
+    # Python 3
+    long = int  # NOQA
+
+ integer_types = int, long,