[Python]オプション解析処理 (optparse)

Example: test00.py

# -*- coding:utf-8 -*-
from optparse import OptionParser
parser = OptionParser()
parser.add_option("-i", "--input", dest="inputFilename", help="Input file name", metavar="[INPUT]")
parser.add_option("-o", "--output", dest="outputFilename", help="Output file name", metavar="[OUTPUT]")
parser.add_option("-v", "--verbose", action="store_true", dest="verbose", default=False, help="Make lots of noise")
(options, args) = parser.parse_args()
print "Input file name : %s" % (options.inputFilename)
print "Output file name: %s" % (options.outputFilename)
print "Verbose : %s" % (options.verbose)

# オプションがない場合は help を表示する
if options.inputFilename == None:
    parser.print_help()
    exit()
if options.outputFilename == None:
    parser.print_help()
    exit()

実行結果

• オプションなしの場合

  $ python test00.py
  Input file name : None
  Output file name: None
  Verbose : False
  Usage: test00.py [options]
  Options:
  -h, --help show this help message and exit
  -i [INPUT], --input=[INPUT]
  Input file name
  -o [OUTPUT], --output=[OUTPUT]
  Output file name
  -v, --verbose Make lots of noise

• help オプションを付けた場合

  $ python test00.py -h
  Usage: test00.py [options]
  Options:
  -h, --help show this help message and exit
  -i [INPUT], --input=[INPUT]
  Input file name
  -o [OUTPUT], --output=[OUTPUT]
  Output file name
  -v, --verbose Make lots of noise

• input, output オプションを付けた場合

  $ python test00.py -i in.txt -o out.txt
  Input file name : in.txt
  Output file name: out.txt
  Verbose : False

• verbose オプションも付けた場合

  $ python test00.py -i in.txt -o out.txt -v
  Input file name : in.txt
  Output file name: out.txt
  Verbose : True