optparse: best way

[Jean-Michel Pichavant]

hiral wrote:
> Hi,
>
> I am using optparser to do following...
>
> Command syntax:
> myscript -o[exension] other_arguments
>     where; extension can be 'exe', 'txt', 'pdf', 'ppt' etc.
>
>
> Now to parse this, I am doing following...
>
> parser.add_option("-oexe', dest=exe_file...)
> parser.add_option("-otxt', dest=txt_file...)
> parser.add_option("-opdf', dest=pdf_file...)
> parser.add_option("-oppt', dest=ppt_file...)
>
> The above way is the most simple way to parser options.
> Can you please suggest any other best way / optimized way to parse
> these kind of options.
>
> Thank you in advance.
>   

Here's a solution:

import optparse

class Process:
    PREFIX = 'dispatch_'
    @staticmethod
    def undef():
        print 'unsupported file type'
    @staticmethod
    def dispatch_exe():
        print 'Hello exe file !'

def dispatchFileType(option, opt, value, parser):
    """Called by the parser, -o option."""
    # call the corresponding method in the process method
    getattr(Process, Process.PREFIX + value, Process.undef)()
   

parser = optparse.OptionParser()
parser.add_option("-o", "--output-fileType", type="string", 
action="callback", callback=dispatchFileType)

options, args = parser.parse_args()


Cheers,

JM