Python : parsing the command line options using optparse

Peter Otten __peter__ at web.de
Wed Feb 26 12:27:17 CET 2014


Ganesh Pal wrote:

> On Tue, Feb 25, 2014 at 9:55 PM, Peter Otten <__peter__ at web.de> wrote:
> 
>>As you are just starting I recommend that you use argparse instead of
>  optparse.
> 
>  I would love to use argparse but  the script that I plan to write has to
> run on host machines that Python 2.6
> 
>  I have freebsd clients  with python  2.6  dont want to install python new
> version on all the host machine which will be eventually upgraded to 2.7 .
> 
> I wanted know if I could use argparse with python 2.6 and is it possible
> to
> add  something like   #pkg_add -r install python-argparse and install
> python argparse module before I use it.

Probably, but I have no experience with freebsd.

>> >If you are asking why short options don't work in conjunction with = --
>> >I don't know, it is probably a design choice of the optparse author.
>> >argparse accepts short options with like -f=1234
> 
>  I wanted to know why my sample program does not work  with short hand
> option (-p) and works with long hand option .
> 
> Here is what is happening ( only short hand with -)
> 
> # 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')
> 
> 
> Result :says  invalid choice: '=XOR'

If you stick with optparse just pass the options without '='

-qXOR

and

-q XOR

should both work.




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