Getting command line arguments as tuples in python

Question

Here is an example of what I would like to call my script:

python script.py -f file1.txt "string1" "string2" -f file2.txt "string3" "string4"

Each file that goes as input will have 2 lines associated with this file. There can be any number of files.

To simplify, I try to get the print as follows:

('file1.txt', 'string1', 'string2')
('file2.txt', 'string3', 'string4')

Here is what I still have:

import sys, os, traceback, optparse
import time
import re
#from pexpect import run, spawn

def main ():
    global options, args

    print options.filename

    #for filename in options.filename:
    #  print filename
      #f = file(filename,'r')
      #for line in f:
      #  print line,
      #f.close()



if __name__ == '__main__':
    try:
        start_time = time.time()
        parser = optparse.OptionParser(formatter=optparse.TitledHelpFormatter(), usage=globals()['__doc__'], version='$Id$')
        parser.add_option ('-f', '--file', dest='filename', help='write report to FILE', metavar='FILE', nargs=3)
        parser.add_option ('-v', '--verbose', action='store_true', default=False, help='verbose output')
        (options, args) = parser.parse_args()
        #if len(args) < 1:
        #    parser.error ('missing argument')
        if options.verbose: print time.asctime()
        main()
        if options.verbose: print time.asctime()
        if options.verbose: print 'TOTAL TIME IN MINUTES:',
        if options.verbose: print (time.time() - start_time) / 60.0
        sys.exit(0)
    except KeyboardInterrupt, e: # Ctrl-C
        raise e
    except SystemExit, e: # sys.exit()
        raise e
    except Exception, e:
        print 'ERROR, UNEXPECTED EXCEPTION'
        print str(e)
        traceback.print_exc()
        os._exit(1)

With the above script, I only get the second file and related lines:

('file2.txt', 'string3', 'string4')

Answer 1

I think you want to use the action=appendmethod argumentadd_argument

import argparse

parser= argparse.ArgumentParser()
parser.add_argument ('-f', '--file', nargs=3, action='append')

files = parser.parse_args('-f file1 string1 string2 -f file2 string3 string4 -f file3 string5 string6'.split()).file

for f in files:
    print tuple(f)

gives you:

('file1', 'string1', 'string2')
('file2', 'string3', 'string4')
('file3', 'string5', 'string6')

Cli testing:

via

import argparse

parser= argparse.ArgumentParser(prog='Test', usage='%(prog)s -f Filename Option1 Option2 ')
parser.add_argument ('-f', '--file', nargs=3, action='append')

files = parser.parse_args().file

for f in files:
    print tuple(f)

results:

python test.py -f file1 "foo bar" "baz" -f file2 foo bar
('file1', 'foo bar', 'baz')
('file2', 'foo', 'bar')

python test.py -f file1 "foo bar" "string2" -f file2 foo bar -f file3 "foo" "bar"
('file1', 'foo bar', 'string2')
('file2', 'foo', 'bar')
('file3', 'foo', 'bar')

python test.py -f file1 "foo bar"
usage: Test -f Filename Option1 Option2
Test: error: argument -f/--file: expected 3 argument(s)

Answer 2

argparse , , , , , - optparse ( , optparse , , , " " ). argparse Python 2.7 3.2, - 2.6.x .

Answer 3

, -f

import getopt
import sys

args = sys.argv[1:]
tuples = []
while args:
    try:
        opts, args = getopt.getopt(args, "f:v", ["file", "verbose"])
    except getopt.GetoptError, err:
        print str(err)
        sys.exit(-1)    

    for o, a in opts:
        if o in ("-f", "--file"):
            tuples.append((a, args.pop(0), args.pop(0)))
        if o in ("-v", "--verbose"):
            print "yep, verbose"

print tuples

Answer 4

:

import getopt
import sys

args = sys.argv[1:]
tuples = []
while args:
try:
    (opts, args) = getopt.getopt(args, "f:v", ["file=", "verbose"])
except getopt.GetoptError, err:
    print str(err)
    sys.exit(2)    

:

-f file1.txt,string1,string2

:

for opt, arg in opts:
    if opt in ("-f", "--file"):
        tuples.append(tuple(arg.split(",")))
    if opt in ("-v", "--verbose"):
        print "yep, verbose"
print tuples

:

-f "file1.txt string1 string2"

, .

Answer 5

If you use optparsebecause you want to remain compatible with python 2.6, the solution also works action='append':

import optparse

parser = optparse.OptionParser()
parser.add_option('-f', '--file', dest='filename', nargs=3, action='append')

Demonstration

>>> (opts, args)  = parser.parse_args("-f file1.txt string1 string2 -f file2.txt string3 string4".split())
>>> for fn_tuple in opts.filename:
...    print fn_tuple
('file1.txt', 'string1', 'string2')
('file2.txt', 'string3', 'string4')