diff --git a/lib/gen_arg.py b/lib/gen_arg.py
index afa7b57..2d2ed68 100755
--- a/lib/gen_arg.py
+++ b/lib/gen_arg.py
@@ -4,11 +4,13 @@
 This module provides valuable argument processing functions like gen_get_options and sprint_args.
 """
 
-import sys
 import os
 import re
+import sys
+
 try:
     import psutil
+
     psutil_imported = True
 except ImportError:
     psutil_imported = False
@@ -16,15 +18,16 @@
     import __builtin__
 except ImportError:
     import builtins as __builtin__
+
+import argparse
 import atexit
 import signal
-import argparse
 import textwrap as textwrap
 
-import gen_print as gp
-import gen_valid as gv
 import gen_cmd as gc
 import gen_misc as gm
+import gen_print as gp
+import gen_valid as gv
 
 
 class MultilineFormatter(argparse.HelpFormatter):
@@ -32,13 +35,20 @@
         r"""
         Split text into formatted lines for every "%%n" encountered in the text and return the result.
         """
-        lines = self._whitespace_matcher.sub(' ', text).strip().split('%n')
-        formatted_lines = \
-            [textwrap.fill(x, width, initial_indent=indent, subsequent_indent=indent) + '\n' for x in lines]
-        return ''.join(formatted_lines)
+        lines = self._whitespace_matcher.sub(" ", text).strip().split("%n")
+        formatted_lines = [
+            textwrap.fill(
+                x, width, initial_indent=indent, subsequent_indent=indent
+            )
+            + "\n"
+            for x in lines
+        ]
+        return "".join(formatted_lines)
 
 
-class ArgumentDefaultsHelpMultilineFormatter(MultilineFormatter, argparse.ArgumentDefaultsHelpFormatter):
+class ArgumentDefaultsHelpMultilineFormatter(
+    MultilineFormatter, argparse.ArgumentDefaultsHelpFormatter
+):
     pass
 
 
@@ -46,8 +56,7 @@
 module = sys.modules["__main__"]
 
 
-def gen_get_options(parser,
-                    stock_list=[]):
+def gen_get_options(parser, stock_list=[]):
     r"""
     Parse the command line arguments using the parser object passed and return True/False (i.e. pass/fail).
     However, if gv.exit_on_error is set, simply exit the program on failure.  Also set the following built in
@@ -75,11 +84,14 @@
     # Process stock_list.
     for ix in range(0, len(stock_list)):
         if len(stock_list[ix]) < 1:
-            error_message = "Programmer error - stock_list[" + str(ix) +\
-                            "] is supposed to be a tuple containing at" +\
-                            " least one element which is the name of" +\
-                            " the desired stock parameter:\n" +\
-                            gp.sprint_var(stock_list)
+            error_message = (
+                "Programmer error - stock_list["
+                + str(ix)
+                + "] is supposed to be a tuple containing at"
+                + " least one element which is the name of"
+                + " the desired stock parameter:\n"
+                + gp.sprint_var(stock_list)
+            )
             return gv.process_error_message(error_message)
         if isinstance(stock_list[ix], tuple):
             arg_name = stock_list[ix][0]
@@ -89,65 +101,86 @@
             default = None
 
         if arg_name not in master_stock_list:
-            error_message = "Programmer error - arg_name \"" + arg_name +\
-                            "\" not found found in stock list:\n" +\
-                            gp.sprint_var(master_stock_list)
+            error_message = (
+                'Programmer error - arg_name "'
+                + arg_name
+                + '" not found found in stock list:\n'
+                + gp.sprint_var(master_stock_list)
+            )
             return gv.process_error_message(error_message)
 
         if arg_name == "quiet":
             if default is None:
                 default = 0
             parser.add_argument(
-                '--quiet',
+                "--quiet",
                 default=default,
                 type=int,
                 choices=[1, 0],
                 help='If this parameter is set to "1", %(prog)s'
-                     + ' will print only essential information, i.e. it will'
-                     + ' not echo parameters, echo commands, print the total'
-                     + ' run time, etc.' + default_string)
+                + " will print only essential information, i.e. it will"
+                + " not echo parameters, echo commands, print the total"
+                + " run time, etc."
+                + default_string,
+            )
         elif arg_name == "test_mode":
             if default is None:
                 default = 0
             parser.add_argument(
-                '--test_mode',
+                "--test_mode",
                 default=default,
                 type=int,
                 choices=[1, 0],
-                help='This means that %(prog)s should go through all the'
-                     + ' motions but not actually do anything substantial.'
-                     + '  This is mainly to be used by the developer of'
-                     + ' %(prog)s.' + default_string)
+                help="This means that %(prog)s should go through all the"
+                + " motions but not actually do anything substantial."
+                + "  This is mainly to be used by the developer of"
+                + " %(prog)s."
+                + default_string,
+            )
         elif arg_name == "debug":
             if default is None:
                 default = 0
             parser.add_argument(
-                '--debug',
+                "--debug",
                 default=default,
                 type=int,
                 choices=[1, 0],
                 help='If this parameter is set to "1", %(prog)s will print'
-                     + ' additional debug information.  This is mainly to be'
-                     + ' used by the developer of %(prog)s.' + default_string)
+                + " additional debug information.  This is mainly to be"
+                + " used by the developer of %(prog)s."
+                + default_string,
+            )
         elif arg_name == "loglevel":
             if default is None:
                 default = "info"
             parser.add_argument(
-                '--loglevel',
+                "--loglevel",
                 default=default,
                 type=str,
-                choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL',
-                         'debug', 'info', 'warning', 'error', 'critical'],
+                choices=[
+                    "DEBUG",
+                    "INFO",
+                    "WARNING",
+                    "ERROR",
+                    "CRITICAL",
+                    "debug",
+                    "info",
+                    "warning",
+                    "error",
+                    "critical",
+                ],
                 help='If this parameter is set to "1", %(prog)s will print'
-                     + ' additional debug information.  This is mainly to be'
-                     + ' used by the developer of %(prog)s.' + default_string)
+                + " additional debug information.  This is mainly to be"
+                + " used by the developer of %(prog)s."
+                + default_string,
+            )
 
     arg_obj = parser.parse_args()
 
     __builtin__.quiet = 0
     __builtin__.test_mode = 0
     __builtin__.debug = 0
-    __builtin__.loglevel = 'WARNING'
+    __builtin__.loglevel = "WARNING"
     for ix in range(0, len(stock_list)):
         if isinstance(stock_list[ix], tuple):
             arg_name = stock_list[ix][0]
@@ -170,15 +203,14 @@
     # For each command line parameter, create a corresponding global variable and assign it the appropriate
     # value.  For example, if the command line contained "--last_name='Smith', we'll create a global variable
     # named "last_name" with the value "Smith".
-    module = sys.modules['__main__']
+    module = sys.modules["__main__"]
     for key in arg_obj.__dict__:
         setattr(module, key, getattr(__builtin__.arg_obj, key))
 
     return True
 
 
-def set_pgm_arg(var_value,
-                var_name=None):
+def set_pgm_arg(var_value, var_name=None):
     r"""
     Set the value of the arg_obj.__dict__ entry named in var_name with the var_value provided.  Also, set
     corresponding global variable.
@@ -193,7 +225,7 @@
         var_name = gp.get_arg_name(None, 1, 2)
 
     arg_obj.__dict__[var_name] = var_value
-    module = sys.modules['__main__']
+    module = sys.modules["__main__"]
     setattr(module, var_name, var_value)
     if var_name == "quiet":
         __builtin__.quiet = var_value
@@ -203,8 +235,7 @@
         __builtin__.test_mode = var_value
 
 
-def sprint_args(arg_obj,
-                indent=0):
+def sprint_args(arg_obj, indent=0):
     r"""
     sprint_var all of the arguments found in arg_obj and return the result as a string.
 
@@ -218,8 +249,9 @@
 
     buffer = ""
     for key in arg_obj.__dict__:
-        buffer += gp.sprint_varx(key, getattr(arg_obj, key), 0, indent,
-                                 col1_width)
+        buffer += gp.sprint_varx(
+            key, getattr(arg_obj, key), 0, indent, col1_width
+        )
     return buffer
 
 
@@ -238,7 +270,7 @@
         # Set a default value for dir_path argument.
         dir_path = gm.add_trailing_slash(gm.dft(dir_path, os.getcwd()))
     """
-    module = sys.modules['__main__']
+    module = sys.modules["__main__"]
     for key in arg_obj.__dict__:
         arg_obj.__dict__[key] = getattr(module, key)
 
@@ -266,16 +298,17 @@
     global term_options
     # Validation:
     arg_names = list(kwargs.keys())
-    gv.valid_list(arg_names, ['term_requests'])
-    if type(kwargs['term_requests']) is dict:
-        keys = list(kwargs['term_requests'].keys())
-        gv.valid_list(keys, ['pgm_names'])
+    gv.valid_list(arg_names, ["term_requests"])
+    if type(kwargs["term_requests"]) is dict:
+        keys = list(kwargs["term_requests"].keys())
+        gv.valid_list(keys, ["pgm_names"])
     else:
-        gv.valid_value(kwargs['term_requests'], ['children', 'descendants'])
+        gv.valid_value(kwargs["term_requests"], ["children", "descendants"])
     term_options = kwargs
 
 
 if psutil_imported:
+
     def match_process_by_pgm_name(process, pgm_name):
         r"""
         Return True or False to indicate whether the process matches the program name.
@@ -325,9 +358,10 @@
         # Because "sleep" is a compiled executable, it will appear in entry 0.
 
         optional_dir_path_regex = "(.*/)?"
-        cmdline = process.as_dict()['cmdline']
-        return re.match(optional_dir_path_regex + pgm_name + '( |$)', cmdline[0]) \
-            or re.match(optional_dir_path_regex + pgm_name + '( |$)', cmdline[1])
+        cmdline = process.as_dict()["cmdline"]
+        return re.match(
+            optional_dir_path_regex + pgm_name + "( |$)", cmdline[0]
+        ) or re.match(optional_dir_path_regex + pgm_name + "( |$)", cmdline[1])
 
     def select_processes_by_pgm_name(processes, pgm_name):
         r"""
@@ -340,7 +374,11 @@
                                     object.
         """
 
-        return [process for process in processes if match_process_by_pgm_name(process, pgm_name)]
+        return [
+            process
+            for process in processes
+            if match_process_by_pgm_name(process, pgm_name)
+        ]
 
     def sprint_process_report(pids):
         r"""
@@ -350,7 +388,10 @@
         pids                        A list of process IDs for processes to be included in the report.
         """
         report = "\n"
-        cmd_buf = "echo ; ps wwo user,pgrp,pid,ppid,lstart,cmd --forest " + ' '.join(pids)
+        cmd_buf = (
+            "echo ; ps wwo user,pgrp,pid,ppid,lstart,cmd --forest "
+            + " ".join(pids)
+        )
         report += gp.sprint_issuing(cmd_buf)
         rc, outbuf = gc.shell_cmd(cmd_buf, quiet=1)
         report += outbuf + "\n"
@@ -371,7 +412,9 @@
         descendants = process.children(recursive=True)
         descendant_pids = [str(process.pid) for process in descendants]
         if descendants:
-            process_report = sprint_process_report([str(process.pid)] + descendant_pids)
+            process_report = sprint_process_report(
+                [str(process.pid)] + descendant_pids
+            )
         else:
             process_report = ""
         return descendants, descendant_pids, process_report
@@ -397,12 +440,15 @@
         children it produces.
         """
 
-        message = "\n" + gp.sprint_dashes(width=120) \
-            + gp.sprint_executing() + "\n"
+        message = (
+            "\n" + gp.sprint_dashes(width=120) + gp.sprint_executing() + "\n"
+        )
 
         current_process = psutil.Process()
 
-        descendants, descendant_pids, process_report = get_descendant_info(current_process)
+        descendants, descendant_pids, process_report = get_descendant_info(
+            current_process
+        )
         if not descendants:
             # If there are no descendants, then we have nothing to do.
             return
@@ -410,38 +456,50 @@
         terminate_descendants_temp_file_path = gm.create_temp_file_path()
         gp.print_vars(terminate_descendants_temp_file_path)
 
-        message += gp.sprint_varx("pgm_name", gp.pgm_name) \
-            + gp.sprint_vars(term_options) \
+        message += (
+            gp.sprint_varx("pgm_name", gp.pgm_name)
+            + gp.sprint_vars(term_options)
             + process_report
+        )
 
         # Process the termination requests:
-        if term_options['term_requests'] == 'children':
+        if term_options["term_requests"] == "children":
             term_processes = current_process.children(recursive=False)
             term_pids = [str(process.pid) for process in term_processes]
-        elif term_options['term_requests'] == 'descendants':
+        elif term_options["term_requests"] == "descendants":
             term_processes = descendants
             term_pids = descendant_pids
         else:
             # Process term requests by pgm_names.
             term_processes = []
-            for pgm_name in term_options['term_requests']['pgm_names']:
-                term_processes.extend(select_processes_by_pgm_name(descendants, pgm_name))
+            for pgm_name in term_options["term_requests"]["pgm_names"]:
+                term_processes.extend(
+                    select_processes_by_pgm_name(descendants, pgm_name)
+                )
             term_pids = [str(process.pid) for process in term_processes]
 
-        message += gp.sprint_timen("Processes to be terminated:") \
-            + gp.sprint_var(term_pids)
+        message += gp.sprint_timen(
+            "Processes to be terminated:"
+        ) + gp.sprint_var(term_pids)
         for process in term_processes:
             process.terminate()
-        message += gp.sprint_timen("Waiting on the following pids: " + ' '.join(descendant_pids))
+        message += gp.sprint_timen(
+            "Waiting on the following pids: " + " ".join(descendant_pids)
+        )
         gm.append_file(terminate_descendants_temp_file_path, message)
         psutil.wait_procs(descendants)
 
         # Checking after the fact to see whether any descendant processes are still alive.  If so, a process
         # report showing this will be included in the output.
-        descendants, descendant_pids, process_report = get_descendant_info(current_process)
+        descendants, descendant_pids, process_report = get_descendant_info(
+            current_process
+        )
         if descendants:
-            message = "\n" + gp.sprint_timen("Not all of the processes terminated:") \
+            message = (
+                "\n"
+                + gp.sprint_timen("Not all of the processes terminated:")
                 + process_report
+            )
             gm.append_file(terminate_descendants_temp_file_path, message)
 
         message = gp.sprint_dashes(width=120)
@@ -470,8 +528,7 @@
     gp.qprint_pgm_footer()
 
 
-def gen_signal_handler(signal_number,
-                       frame):
+def gen_signal_handler(signal_number, frame):
     r"""
     Handle signals.  Without a function to catch a SIGTERM or SIGINT, the program would terminate immediately
     with return code 143 and without calling the exit_function.
@@ -486,8 +543,7 @@
     exit(0)
 
 
-def gen_post_validation(exit_function=None,
-                        signal_handler=None):
+def gen_post_validation(exit_function=None, signal_handler=None):
     r"""
     Do generic post-validation processing.  By "post", we mean that this is to be called from a validation
     function after the caller has done any validation desired.  If the calling program passes exit_function