On Oct 16, 10:59 pm, jimgardener <jimgarde...@gmail.com> wrote:
> hi
> I have a program which I call findmatch that expects these arguments
> 1.a person name
> 2.a group name
> 3.an integer
> 4.a float value
>
> I thought I would allow user to call this program either using options
> or using positional arguments in a predefined order
> ie,
> findmatch -f schoolmates -i jon -t 3.5 -n 115
> or
> findmatch jon schoolmates 115 3.5
>
> I tried to code this using optparser..
>
> def parse_arguments():
> usage = """usage: %prog [options]
> eg:
> findmatch -i jon -f schoolmates -n 115 -t 3.5
> """
> parser = OptionParser(usage)
>
> parser.add_option('-i','--person',dest='personname',help='person
> to be matched')
> parser.add_option('-f','-group',dest='groupname', help='group
> containing people to be tested against')
> parser.add_option('-n','--
> num',dest='samplenumber',type='int',help='how many samples to be used
> ')
> parser.add_option('-t','--
> cutoff',dest='cutoff',type='float',help='some upperlimit ')
>
> options,args = parser.parse_args()
>
> def check_if_person_name_valid(name):
> if not person_exists(name):
> parser.error('you must give an valid person name')
> def check_if_group_name_valid(name):
> if not group_exists(name):
> parser.error('you must give a valid group')
>
> if not options.personname or not options.groupname:
> print parser.format_help()
> parser.exit()
> check_if_person_name_valid(options.personname)
> check_if_group_name_valid(options.groupname)
>
> return options
>
> iif __name__=='__main__':
> options = parse_arguments()
> person_name = options.personname
> group = options.groupname
> number_of_samples_to_use = options.samplenumber
> cutoff = options.cutoff
> msg = 'You are trying to match {0} against group {1} using {2}
> samples \
> and using {3:2.2f} as the upper limit '
> print msg.format(person_name , group , number_of_samples_to_use ,
> cutoff )
>
> This can handle keyword arguments.But if I have to allow a user to
> input arguments without options
> ie
> findmatch jon schoolmates 115 3.5
>
> can I do this in the above method? If user enters the above line ,the
> options instance would have
> { 'personname': None ,'groupname': None ...}
> and
> args will contain a list of positional arguments .
>
> I am not sure how this can be processed so that a user is given
> freedom to choose either.
> Any suggestions most welcome.
> regards,
> jim
You could check if args has 4 elements, assuming they are the
positional args just assign them to the options
Or you could check the command line to see if there are any items
starting with '-', and then proceed accordingly.
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