Github user tliron commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/100#discussion_r115289497
--- Diff: aria/utils/versions.py ---
@@ -0,0 +1,162 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+"""
+General-purpose version string handling
+"""
+
+import re
+
+
+_INF = float('inf')
+
+_NULL = (), _INF
--- End diff --
Because "Numeric qualifiers will always be greater than prefixed integer
qualifiers, e.g. "1.1-1" > "1.1-beta1". The qualifier is a float that is an
extra, but if the qualifier is not present "infinity" should always win over
it. It shouldn't matter what's "more natural" seeming: this is an underscored
internal var that's never seen by users of the lib. Users instead use
`VersionString.NULL` or can init `VersionString` with None.
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