set default input version to the latest official release, which is th…

…e 2nd highest coordinated release version number in the version lookup table. This assumes that the highest version is what is being developed towards

metplus/component_versions.py

@@ -34,6 +34,10 @@
     },
 }
 
+# assumes the 2nd highest version in the table is the latest
+# the highest version in the table is in development
+LATEST_OFFICIAL_RELEASE = sorted(VERSION_LOOKUP.keys(), reverse=True)[1]
+
 DEFAULT_OUTPUT_FORMAT = "v{X}.{Y}.{Z}{N}"
 
 def get_component_version(input_component, input_version, output_component,
@@ -99,9 +103,9 @@ def main():
                         help='Name of METplus component to use to find version,'
                         ' default is METplus.')
     parser.add_argument('-v', '--input_version',
-                        default=next(iter(VERSION_LOOKUP)),
+                        default=LATEST_OFFICIAL_RELEASE,
                         help='version of input_component to search,'
-                             ' default is upcoming version')
+                             ' default is latest official release')
     parser.add_argument('-o', '--output_component', required=True,
                         help='name of METplus component to obtain version')
     parser.add_argument('-f', '--output_format',