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実際に、実行してみると、以下のようになる。#!/usr/pkg/bin/python3.9 # importing argparse module import argparse # initialising a parser parser = argparse.ArgumentParser (description='adding two integers') # adding arguments parser.add_argument ('-a', type=int, default=0, help='integer 1') parser.add_argument ('-b', type=int, default=0, help='integer 2') # parsing arguments args = parser.parse_args () # printing arguments print ("args =", args) # two numbers a = args.a b = args.b # printing a and b print ("a =", a) print ("b =", b) # calculation c = a + b # printing result print ("c =", c)
引数は整数でなければならないので、浮動小数点を与えるとエラーとなる。% ./test_argparse_0.py -h usage: test_argparse_0.py [-h] [-a A] [-b B] adding two integers optional arguments: -h, --help show this help message and exit -a A integer 1 -b B integer 2 % ./test_argparse_0.py -a 2 -b 3 args = Namespace(a=2, b=3) a = 2 b = 3 c = 5
% ./test_argparse_0.py -a 2.0 -b 3.0 usage: test_argparse_0.py [-h] [-a A] [-b B] test_argparse_0.py: error: argument -a: invalid int value: '2.0'
実行してみる。#!/usr/pkg/bin/python3.9 # importing argparse module import argparse # initialising a parser parser = argparse.ArgumentParser (description='adding two floats') # adding arguments parser.add_argument ('-a', type=float, default=0.0, help='float 1') parser.add_argument ('-b', type=float, default=0.0, help='float 2') # parsing arguments args = parser.parse_args () # printing arguments print ("args =", args) # two numbers a = args.a b = args.b # printing a and b print ("a =", a) print ("b =", b) # calculation c = a + b # printing result print ("c =", c)
% ./test_argparse_1.py -h usage: test_argparse_1.py [-h] [-a A] [-b B] adding two floats optional arguments: -h, --help show this help message and exit -a A float 1 -b B float 2 % ./test_argparse_1.py -a 1.2 -b 3.4 args = Namespace(a=1.2, b=3.4) a = 1.2 b = 3.4 c = 4.6
実行してみる。#!/usr/pkg/bin/python3.9 # importing argparse module import argparse # initialising a parser parser = argparse.ArgumentParser (description='processing files') # adding arguments parser.add_argument ('files', nargs='+', help='FITS files') # parsing arguments args = parser.parse_args () # printing arguments print ("args =", args) # FITS files files = args.files # printing file names print ("list of files:") for file in files: print (" ", file)
% ./test_argparse_2.py -h usage: test_argparse_2.py [-h] files [files ...] processing files positional arguments: files FITS files optional arguments: -h, --help show this help message and exit % ./test_argparse_2.py a.fits b.fits c.fits args = Namespace(files=['a.fits', 'b.fits', 'c.fits']) list of files: a.fits b.fits c.fits
実行してみる。#!/usr/pkg/bin/python3.9 # importing argparse module import argparse # initialising a parser parser = argparse.ArgumentParser (description='arithmetic operation') # adding arguments parser.add_argument ('file1', nargs=1, default='a.fits', help='FITS file 1') parser.add_argument ('op', choices=['+', '-', 'x', '/'], default='+', help='arithmetic operator') parser.add_argument ('file2', nargs=1, default='b.fits', help='FITS file 2') parser.add_argument ('file3', nargs=1, default='c.fits', help='FITS file 3') # parsing arguments args = parser.parse_args () # printing arguments print ("args =", args) # FITS files file1 = args.file1[0] op = args.op file2 = args.file2[0] file3 = args.file3[0] # printing command print ("command:", file1, op, file2, "-->", file3)
% ./test_argparse_3.py -h
usage: test_argparse_3.py [-h] file1 {+,-,x,/} file2 file3
arithmetic operation
positional arguments:
file1 FITS file 1
{+,-,x,/} arithmetic operator
file2 FITS file 2
file3 FITS file 3
optional arguments:
-h, --help show this help message and exit
% ./test_argparse_3.py raw.fits - bias.fits red.fits
args = Namespace(file1=['raw.fits'], op='-', file2=['bias.fits'], file3=['red.fits'])
command: raw.fits - bias.fits --> red.fits
実行してみる。#!/usr/pkg/bin/python3.9 # importing argparse module import argparse # initialising a parser parser = argparse.ArgumentParser (description='long option') # adding arguments parser.add_argument ('-o', '--output', default='out.fits', help='output file') parser.add_argument ('files', nargs='+', help='input files') # parsing arguments args = parser.parse_args () # printing arguments print ("args =", args) # FITS files file_output = args.output files_input = args.files # printing input parameters print ("output file:", file_output) print ("input files:") for file in files_input: print (" ", file)
% ./test_argparse_4.py -h
usage: test_argparse_4.py [-h] [-o OUTPUT] files [files ...]
long option
positional arguments:
files input files
optional arguments:
-h, --help show this help message and exit
-o OUTPUT, --output OUTPUT
output file
% ./test_argparse_4.py --output out.fits a.fits b.fits c.fits d.fits e.fits
args = Namespace(output='out.fits', files=['a.fits', 'b.fits', 'c.fits', 'd.fits', 'e.fits'])
output file: out.fits
input files:
a.fits
b.fits
c.fits
d.fits
e.fits