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Archives July 2, 2012

Python Argparse - Parsing Command Line Scipt Arguments

The python argparse module is quite nifty.  In the past I have used code like this to parse arguments to command line scripts:

import sys

prog_name        = sys.argv[0]

def printUsage():
  print 'Usage: ' + prog_name + ' USEFUL_ARGUMENT'
  print 'This script does something useful with an argument.\n'
  print 'Examples:'
  print '  '+ prog_name + ' USEFUL_ARGUMENT\n'
  exit()


sys.argv.remove(prog_name)
if '-h' in sys.argv or '--help' in sys.argv or len(sys.argv) != 1:
  printUsage()

useful_arg = sys.argv[0]

The argparse module helps to eliminate boilerplate code, provides nice formatting for free, and provides useful features. Here is the same code using the ...

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