Change --galaxy_python_version default to None

Follow up on commit 6047d8b .

Author: nsoranzo

planemo/galaxy/config.py

@@ -399,7 +399,7 @@ def config_join(*args):
         )
         _ensure_directory(shed_tool_path)
         port = _get_port(kwds)
-        if parse_version(kwds.get('galaxy_python_version', DEFAULT_PYTHON_VERSION)) >= parse_version('3'):
+        if parse_version(kwds.get('galaxy_python_version') or DEFAULT_PYTHON_VERSION) >= parse_version('3'):
             # on python 3 we use gunicorn,
             # which requires 'main' as server name
             server_name = 'main'
@@ -947,7 +947,7 @@ def startup_command(self, ctx, **kwds):
             run_script += " --server-name %s" % shlex_quote(self.server_name)
         server_ini = os.path.join(self.config_directory, "galaxy.ini")
         self.env["GALAXY_CONFIG_FILE"] = server_ini
-        if parse_version(kwds.get('galaxy_python_version', DEFAULT_PYTHON_VERSION)) >= parse_version('3'):
+        if parse_version(kwds.get('galaxy_python_version') or DEFAULT_PYTHON_VERSION) >= parse_version('3'):
             # We need to start under gunicorn
             self.env['APP_WEBSERVER'] = 'gunicorn'
             self.env['GUNICORN_CMD_ARGS'] = "--bind={host}:{port} --name={server_name}".format(

planemo/galaxy/run.py

@@ -58,7 +58,7 @@ def locate_galaxy_virtualenv(ctx, kwds):
         workspace = ctx.workspace
         galaxy_branch = kwds.get("galaxy_branch") or "master"
         shared_venv_path = os.path.join(workspace, "gx_venv")
-        galaxy_python_version = kwds.get('galaxy_python_version', DEFAULT_PYTHON_VERSION)
+        galaxy_python_version = kwds.get('galaxy_python_version') or DEFAULT_PYTHON_VERSION
         if galaxy_python_version != DEFAULT_PYTHON_VERSION:
             shared_venv_path = "%s_%s" % (shared_venv_path, galaxy_python_version)
         if galaxy_branch != "master":

planemo/options.py

@@ -133,7 +133,7 @@ def galaxy_python_version():
     return planemo_option(
         '--galaxy_python_version',
         use_global_config=True,
-        default='2.7',
+        default=None,
         type=click.Choice(['2', '2.7', '3', '3.3', '3.4', '3.5', '3.6', '3.7']),
         help="Python version to start Galaxy under",
     )