python - Can't pass values via command line -

i have write program reads file , writes analysis text file. program has take information via command line can't see, figure out given template. wrote test program see if succesfully pass command line input class.

#!/usr/bin/env python3  ######################################################################## # commandline ######################################################################## class commandline() :     '''     handle command line, usage , requests.      commandline uses argparse, standard in 2.7 , beyond.      implements standard command line argument parser various argument options,     standard usage , help, , error termination mechanism do-usage_and_die.      attributes:     arguments received commandline using .add_argument     avalable within .args attribute of object instantiated commandline.     example, if mycommandline object of class, , requiredbool     set option using add_argument, mycommandline.args.requiredbool     name option.      '''      def __init__(self, inopts=none) :         '''         commandline constructor.         implements parser interpret command line argv string using argparse.         '''          import argparse         self.parser = argparse.argumentparser(description = 'program prolog - brief description of thing does',                                               epilog = 'program epilog - other stuff feel compelled say',                                               add_help = true, #default true                                               prefix_chars = '-',                                               usage = '%(prog)s [options] -option1[default] <input >output'                                              )         self.parser.add_argument('infile', action = 'store', help='input file name')         self.parser.add_argument('outfile', action = 'store', help='output file name')          self.parser.add_argument('-lg', '--longestgene', action = 'store', nargs='?', const=true, default=true, help='longest gene in orf')         self.parser.add_argument('-mg', '--mingene', type=int, choices= range(0, 2000), action = 'store', help='minimum gene length')         self.parser.add_argument('-s', '--start', action = 'append', nargs='?', help='start codon') #allows multiple list options         self.parser.add_argument('-v', '--version', action='version', version='%(prog)s 0.1')           if inopts none :             self.args = self.parser.parse_args()         else :             self.args = self.parser.parse_args(inopts)  ######################################################################## #main goes here ########################################################################   def main(mycommandline=none):     '''     implements usage exception handler can raised anywhere in process.        '''      mycommandline = commandline(mycommandline)          #mycommandline.args.infile #has input file name         #mycommandline.args.outfile #has output file name         #mycommandline.args.longestgene #is true if longest gene desired         #mycommandline.args.start #is list of start codons         #mycommandline.args.mingene #is minimum gene length include      print (mycommandline.args) # print parsed argument string .. there nothing better      if mycommandline.args.longestgene:         print ('longestgene is', str(mycommandline.args.longestgene) )     else :         pass     class test:         def __init__(self):             print(mycommandline.args.mingene)  if __name__ == "__main__":     main()  class test:     def __init__(self):         self.test()      def test(self, infile = mycommandline.args.infile, outfile = mycommandline.args.outfile, longest = mycommandline.args.longestgene, start = mycommandline.args.start, min = mycommandline.args.mingene):         print(infile)         print(outfile)         print(longest)         print(start)         print(min)  new_obj = test() 

the command line input should like: python testcommand.py -ming 100 -longestg -starts atg tass2orfdata-atg-100.txt

supposedly main program goes says "main goes here" when tried got error "mycommandline not defined". moved program end. error 'the '>' operator reserved future use"

i'm using powershell if matters. how data class?

you don't need commandline class. suggested james mills, here example:

import argparse  class test:     def __init__(self, infile, outfile, longest, start, min):         self.infile = infile         self.test()      def test(self):         print(self.infile)  def main():     parser = argparse.argumentparser(description = 'program prolog',                                       epilog = 'program epilog',                                       add_help = true, #default true                                       prefix_chars = '-',                                       usage = 'xxx')     parser.add_argument('-i', '--infile', action = 'store', help='input file name')     parser.add_argument('-o', '--outfile', action = 'store', help='output file name')      parser.add_argument('-lg', '--longestgene', action = 'store', nargs='?', const=true, default=true, help='longest gene in orf')     parser.add_argument('-mg', '--mingene', type=int, choices= range(0, 20), action = 'store', help='minimum gene length')     parser.add_argument('-s', '--start', action = 'append', nargs='?', help='start codon') #allows multiple list options     parser.add_argument('-v', '--version', action='version', version='%(prog)s 0.1')       args = parser.parse_args()     test = test(args.infile, args.outfile, args.longestgene, args.mingene, args.start)  if __name__ == '__main__':     main()