class_docstr: A custom action to convert bools from shell format i.e., true/false
  to python format i.e., True/False 
class_docstr_tok: ["A","custom","action","to","convert","bools","from","shell","format","i.e.",",","true\/false","to","python","format","i.e.",",","True\/False"]
code: def __call__(self, parser, namespace, values, option_string=None):
      try:
          setattr(namespace, self.dest, str_to_bool(values))
      except ValueError:
          raise Exception(
              "Unknown value {0} for --{1}".format(values, self.dest)
          )
  
imports: from __future__ import print_function
  from __future__ import division
  import argparse
  import logging
  import math
  import os
  import subprocess
  import sys
  import threading
label_desc: Use image node_id 1 for calling the StrToBoolAction obj's underlying member method code with example usage: obj.__call__(parser, namespace, values, option_string) without return types