Updating version parser because the prior one (distutils.version) is …

…obsolete, violates current python version guides (PEP 440), and undocumented. The new parser is part of setuptools, which is required to install switch (it's an import in setup.py).

Changing version number from alpha to dev which seems a better name for this staging branch.

switch_model/upgrade/manager.py

@@ -7,7 +7,7 @@
 import argparse
 import os
 import shutil
-from distutils.version import StrictVersion
+from pkg_resources import parse_version
 
 import switch_model
 
@@ -35,7 +35,7 @@
 # Not every code revision requires an update; this is the last revision that did.
 last_required_update = upgrade_plugins[-1][-1]
 
-code_version = StrictVersion(switch_model.__version__)
+code_version = parse_version(switch_model.__version__)
 version_file = 'switch_inputs_version.txt'
 #verbose = False
 verbose = True
@@ -93,7 +93,7 @@ def do_inputs_need_upgrade(inputs_dir):
     # Not every code revision requires an update, so just hard-code the last
     # revision that required an update.
     inputs_version = get_input_version(inputs_dir)
-    return StrictVersion(inputs_version) < StrictVersion(last_required_update)
+    return parse_version(inputs_version) < parse_version(last_required_update)
 
 
 def _backup(inputs_dir):
@@ -122,15 +122,15 @@ def upgrade_inputs(inputs_dir, backup=True, assign_current_version=False):
             _backup(inputs_dir)
         # Successively apply the upgrade scripts as needed.
         for (upgrader, v_from, v_to) in upgrade_plugins:
-            inputs_v = StrictVersion(get_input_version(inputs_dir))
+            inputs_v = parse_version(get_input_version(inputs_dir))
             # note: the next line catches datasets created by/for versions of Switch that
             # didn't require input directory upgrades
-            if StrictVersion(v_from) <= inputs_v < StrictVersion(v_to):
+            if parse_version(v_from) <= inputs_v < parse_version(v_to):
                 print_verbose('\tUpgrading from ' + v_from + ' to ' + v_to)
                 upgrader.upgrade_input_dir(inputs_dir)
         upgraded = True
 
-    if (StrictVersion(last_required_update) < StrictVersion(switch_model.__version__)
+    if (parse_version(last_required_update) < parse_version(switch_model.__version__)
             and assign_current_version):
         # user requested writing of current version number, even if no upgrade is needed
         # (useful for updating examples to track with new release of Switch)

switch_model/version.py

@@ -1,9 +1,8 @@
 # Copyright (c) 2015-2019 The Switch Authors. All rights reserved.
 # Licensed under the Apache License, Version 2.0, which is in the LICENSE file.
 """
-This file should only include the version. Do not import any packages or
-modules here because this file needs to be executed before Switch is
-installed and executed in environments that don't have any dependencies
-installed.
+This file should not contain anything that is not part of a minimal python
+distribution because it needs to be executed before Switch (and its
+dependencies) are installed.
 """
-__version__='2.0.6-alpha'
+__version__='2.0.6-dev'