****************************** PYTHON ***********************************

import argparse

import sys

import os

#import ipdb

import traceback

program_name="ECC108-Lab06-TestApp"

program_version="v1.0"

program_name_version = "%s %s" % (program_name, program_version)

class Lab06_TestApp( object ):

def __init__( self, config_file, input_files, output_file ):

#

print( "" )

print( "Input parameters: -----------------" )

print( "Config: {}".format( config_file ) )

print( "Inputs: {}".format( input_files ) )

print( "Output: {}".format( output_file ) )

def check_filepaths( input_files, output_file ):

"""

"""

#ipdb.set_trace()

all_filepaths = list( map( lambda p: os.path.abspath( p ), input_files ) )

print( "--- All absolute filepaths: {}".format( all_filepaths ) )

if os.path.exists( output_file ):

#

print( "" )

print( "### Output file is an existing file: {}".format( output_file ) )

print( "" )

print( " This program will NOT overwrite existing files unless forced" )

print( " to do so. To force this, please use argument -f or --force " )

print( " to override this behavior. Make sure that output file path" )

print( " will not cause a needed file to be overwritten." )

print( "" )

return False

else:

return True

def process_commandline_arguments():

"""

Processes command-line arguments and returns them.

"""

parser = argparse.ArgumentParser( description="" )

parser.add_argument( 'input_files', nargs='*',

help='Input file name/path' )

parser.add_argument( "--version", action="version",

version=program_name_version,

help="Print the version of this program." )

parser.add_argument( "--debug", dest="debug", action="store_true",

help="Turn debugging on (default=off)." )

parser.add_argument( "-v", "--verbose", action="store_true", dest="verbose",

help="Turn verbose on (default=off)" )

parser.add_argument( "-f", "--force", action="store_true", dest="force",

help="Force overwriting of existing files (default=off)" )

parser.add_argument( "--config", dest="config", default=None,

help="Specify configuration file path" )

parser.add_argument( "--outfile", dest="outfile", default="output.dat",

help="Specify the path of the output file" )

args = None

try:

args = parser.parse_args()

print( "--- args: %s" % args )

except SystemExit as se:

sys.exit( 1 )

except Exception as e:

sys.exit( 1 )

#import pdb

#pdb.set_trace()

return args

try:

args = process_commandline_arguments()

if args.input_files:

#

print( "--- %s starting ..." % program_name_version );

if not args.force and not check_filepaths( args.input_files, output_file=args.outfile ):

#

sys.exit( 0 )

##if not args.config:

## #

## module_dir = os.path.dirname( __file__ )

## args.config = os.path.join( module_dir, "lab06-testapp-config.ini" )

testapp = Lab06_TestApp( args.config, args.input_files, args.outfile )

print( " Done." )

else:

print( " *** Please enter required arguments and retry. " )

except Exception as e:

print( "*** Error: {}".format( e ) )

print( traceback.format_exc() )

print( "--- Exiting without generating an output file." )

sys.exit( 1 )

Exercise Now do the following . Add a new parameter called check with a default value of" (empty string) Demonstrate that you can grab the value passed in the check argument