Simplify list expression and add license

system_demo_mode/config.py

+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+
 import os
 
 
@@ -37,17 +57,18 @@ def as_string(dirpath, random_order, exit, **kwargs):
     cfg, dirpath = generate(dirpath, random_order, **kwargs)
 
     # hint for reader, can be used if files are not found.
-    cfg_str = []
-    cfg_str += ["# generated file\n"]
-    cfg_str += ["\n"]
-    cfg_str += ["# edit the search path so other systems may find the files below\n"]
-    cfg_str += ["# based on name only if the absolute paths cant be found\n"]
-    cfg_str += ["# Use '//' for current blend file path.\n"]
-    cfg_str += ["\n"]
-    cfg_str += ["search_path = %r\n" % dirpath]
-    cfg_str += ["\n"]
-    cfg_str += ["exit = %r\n" % exit]
-    cfg_str += ["\n"]
+    cfg_str = [
+        "# generated file\n",
+        "\n",
+        "# edit the search path so other systems may find the files below\n",
+        "# based on name only if the absolute paths cant be found\n",
+        "# Use '//' for current blend file path.\n",
+        "\n",
+        "search_path = %r\n" % dirpath,
+        "\n",
+        "exit = %r\n" % exit,
+        "\n",
+        ]
 
     # All these work but use nicest formatting!
     if 0:  # works but not nice to edit.