これは日々の作業を通して学んだことや毎日の生活で気づいたことをを記録しておく備忘録である。
HTML ファイル生成日時: 2024/05/08 09:31:52.302 (台灣標準時)
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