optparse: best way
in [Python]
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From: Peter Otten on 8 Jun 2010 06:31 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. You could limit the value for the -o option with parser.add_option("-o", dest="ext", choices="exe txt pdf ppt".split()) and do the actual work outside the OptionParser. options, args = parser.parse_args() def process_exe(): # whatever actions = {"exe": process_exe, ...} actions[options.ext]() Peter
From: Hrvoje Niksic on 8 Jun 2010 07:30 Thomas Jollans <thomas(a)jollans.com> writes: > UNIX and GNU recommendations. I've never actually heard of optparser, > but I'd expect it to have the usual limitations: Hiral probably meant to write "optparse", which supports GNU-style options in a fairly standard and straightforward way. Which includes that defining a "-o"/"--output-format" option that takes an argument allows you to write one of "-o exe", "-oexe", "--output-format=exe", or "--output-format exe". My recommendation is to use -o, and -oexe will work just fine.
From: hiral on 9 Jun 2010 05:52 On Jun 8, 3:03 pm, Jean-Michel Pichavant <jeanmic...(a)sequans.com> wrote: > hiralwrote: > > 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- Hide quoted text - > > - Show quoted text - Hi JM, Here it gives... $ python above_script.py -oexe abc Hello exe file ! {'output_fileType': None} # print options ['abc'] # print args In my case I require to have 'options' to consume 'abc' like... {'output_fileType': 'abc'} Thank you.
From: hiral on 9 Jun 2010 05:54 On Jun 8, 4:30 pm, Hrvoje Niksic <hnik...(a)xemacs.org> wrote: > Thomas Jollans <tho...(a)jollans.com> writes: > > UNIX and GNU recommendations. I've never actually heard of optparser, > > but I'd expect it to have the usual limitations: > > Hiralprobably meant to write "optparse", which supports GNU-style > options in a fairly standard and straightforward way. Which includes > that defining a "-o"/"--output-format" option that takes an argument > allows you to write one of "-o exe", "-oexe", "--output-format=exe", or > "--output-format exe". > > My recommendation is to use -o, and -oexe will work just fine. Thank you all :) for your kind suggestins. All your suggestions are fine and valid, which suggest to have option '-o' and take its value 'exe ppt pdf txt' etc. Yes, I am planning to use GNU style options... One advantage with this that user can pass a.txt but can specify it as '-oexe' and it would get executed as 'process_exe()'. So to say we don't have support for '-o<extensions> value' in python; but there are ways to acheive this. It seems as of now I should specify them as seperate options like... > parser.add_option("-o', dest=exe_file...) > 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...) Thank you in advance. -Hiral
From: Jean-Michel Pichavant on 9 Jun 2010 06:11
hiral wrote: > On Jun 8, 3:03 pm, Jean-Michel Pichavant <jeanmic...(a)sequans.com> > wrote: > >> hiralwrote: >> >>> 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- Hide quoted text - >> >> - Show quoted text - >> > > Hi JM, > > Here it gives... > $ python above_script.py -oexe abc > Hello exe file ! > {'output_fileType': None} # print options > ['abc'] # print args > > In my case I require to have 'options' to consume 'abc' like... > {'output_fileType': 'abc'} > > Thank you. > > use python above_script.py -o "exe abc" and change the dispatch function to def dispatchFileType(option, opt, value, parser): """Called by the parser, -o option.""" # call the corresponding method in the process method for item in value.split(): getattr(Process, Process.PREFIX + item, Process.undef)() Regards, JM |