diff --git a/bin/validate_plug_ins.py b/bin/validate_plug_ins.py
index fa12f66..78e65e5 100755
--- a/bin/validate_plug_ins.py
+++ b/bin/validate_plug_ins.py
@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 
 
-import os
-import sys
-
+from gen_print import *
 from gen_arg import *
 from gen_plug_in import *
-from gen_print import *
+
+import sys
+import os
 
 try:
     import __builtin__
@@ -31,32 +31,32 @@
 
 # Create parser object.
 parser = argparse.ArgumentParser(
-    usage="%(prog)s [OPTIONS] [PLUG_IN_DIR_PATHS]",
+    usage='%(prog)s [OPTIONS] [PLUG_IN_DIR_PATHS]',
     description="%(prog)s will validate the plug-in packages passed to it."
-    + "  It will also print a list of the absolute plug-in"
-    + " directory paths for use by the calling program.",
+                + "  It will also print a list of the absolute plug-in"
+                + " directory paths for use by the calling program.",
     formatter_class=argparse.ArgumentDefaultsHelpFormatter,
-    prefix_chars="-+",
-)
+    prefix_chars='-+')
 
 # Create arguments.
 parser.add_argument(
-    "plug_in_dir_paths",
-    nargs="?",
+    'plug_in_dir_paths',
+    nargs='?',
     default="",
-    help=plug_in_dir_paths_help_text + default_string,
-)
+    help=plug_in_dir_paths_help_text + default_string)
 
 parser.add_argument(
-    "--mch_class", default="obmc", help=mch_class_help_text + default_string
-)
+    '--mch_class',
+    default="obmc",
+    help=mch_class_help_text + default_string)
 
 # The stock_list will be passed to gen_get_options.  We populate it with the names of stock parm options we
 # want.  These stock parms are pre-defined by gen_get_options.
 stock_list = [("test_mode", 0), ("quiet", 1), ("debug", 0)]
 
 
-def exit_function(signal_number=0, frame=None):
+def exit_function(signal_number=0,
+                  frame=None):
     r"""
     Execute whenever the program ends normally or with the signals that we catch (i.e. TERM, INT).
     """
@@ -114,9 +114,8 @@
     global plug_in_dir_paths
     global mch_class
 
-    plug_in_packages_list = return_plug_in_packages_list(
-        plug_in_dir_paths, mch_class
-    )
+    plug_in_packages_list = return_plug_in_packages_list(plug_in_dir_paths,
+                                                         mch_class)
     qprint_var(plug_in_packages_list)
 
     # As stated in the help text, this program must print the full paths of each selected plug in.