Hi Folks ,
Iam newbie to Python, Iam trying to use optparse module and write a script
that will parse the command line options ..I had to use opt parse instead
of argparse because by host Operating system is still using python 2.6
Below is the simple program ( Feel free to correct the error ) and 3 quick
questions on the same.
/* sample Program "/
import optparse
parser = optparse.OptionParser()
parser.add_option("-p", "--path", action="store",
metavar="/ifs/<file_name>|/ifs/<dir_name>", dest="path_name",
type="string",
help = "The file or directory path of the object in
/ifs",)
parser.add_option("-q", "--operation", action="store",
metavar="XOR|ADD|SET", dest="operation_type", default='SET',
type='choice', choices=['XOR', 'ADD', 'SET'],
help = "The corruption operation on the object [default :
%default]",)
parser.add_option("-f", "--offset", action="store", metavar="HEX",
dest="offset_value", default=0x41306141,
type="long",
help= "The valid offset value [default : %default]" )
parser.add_option("-n", "--node", action="store",metavar="id",
dest="node_value", default= 1,
type='int',
help = "The node id [default : %default]")
parser.add_option("-l", "--log", action="store_true",dest="log_file",
help = "log the isi_corrupt execution result ")
parser.add_option("-c", "--fixcrc", action="store_true",dest="fix_crc",
help = "The CRC fix of the corrupted objects ")
# instruct optparse to parse the program's command line:
(options, args) = parser.parse_args()
print options.path_name
Questions (1)
#python python-5.py --path=/ifs/1.txt --operation=XOR --node=11 --log
-fixcrc
>> Looks like the dest variable stores it in a dictionary ,
>> print options.path_name ( gives the option entered in the command
line)
/ifs/1.txt
I wanted to store all the options in a list like
[/ifs/1.txt,XOR,11,log_file,fix_crc]
please suggest on the same ?
Question(2)
Why does this program work only with - option and not - in the above code
?
I think its not working when the type= 'choice' or its somethimf else ?
# python-5.py -p=/ifs/1.txt -q=XOR -f=1234 -n=1 -l
Usage: python-5.py [options]
python-5.py: error: option -q: invalid choice: '=XOR' (choose from 'XOR',
'ADD',
'SET', 'MODIFY', 'RENAME', 'DELETE', 'KILL')
This Works ( --)
C:\Users\bahadg\Desktop>python python-5.py --path=/ifs/1.txt
--operation=XOR --
offset=1234 --node=1 --log --fixcrc
/ifs/1.txt
Question (3)
If I have really long metavar and the help looks very messy ,is there a
way to make it look elegant.
Example :
parser.add_option("-q", "--operation", action="store",
metavar="XOR|ADD|SET|MODIFY|RENAME|DELETE|KILL|", dest="operation_type",
default='SET',
type='choice', choices=['XOR', 'ADD', 'SET'
|'MODIFY'|'RENAME'|'DELETE'|'KILL'],
help = "The corruption operation on the object [default :
%default]",)
#python-5.py --help
Usage: python-5.py [options]
Options:
-h, --help show this help message and exit
-p /ifs/<file_name>|/ifs/<dir_name>,
--path=/ifs/<file_name>|/ifs/<dir_name>
The file or directory path of the object in /ifs
-q XOR|ADD|SET|MODIFY|RENAME|DELETE|KILL|,
--operation=XOR|ADD|SET|MODIFY|RENA
ME|DELETE|KILL|
The corruption operation on the object [default :
SET]
-f HEX, --offset=HEX The valid offset value [default : 1093689665]
-n id, --node=id The node id [default : 1]
-l, --log log the isi_corrupt execution result
-c, --fixcrc The CRC fix of the corrupted objects
Thanks is advance !!
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