Python argparse Module

A Python argparse Module is a command-line argument processing Function for Python programs.

• • …
• Counter-Exam

ple(s):

• • Perl GetOptions Subroutine.
• See: Command-line Option, Command-line Options Processor.

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References

2017

• https://docs.python.org/3/library/argparse.html
  • QUOTE: The argparse module makes it easy to write user-friendly command-line interfaces. The program defines what arguments it requires, and argparse will figure out how to parse those out of sys.argv. The argparse module also automatically generates help and usage messages and issues errors when users give the program invalid arguments.
  • Example. The following code is a Python program that takes a list of integers and produces either the sum or the max:

import argparse 

parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument('integers', metavar='N', type=int, nargs='+',
                   help='an integer for the accumulator')
parser.add_argument('--sum', dest='accumulate', action='store_const',
                   const=sum, default=max,
                   help='sum the integers (default: find the max)') 

args = parser.parse_args()
print(args.accumulate(args.integers))

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