Django management command and argparse

Question

I'm trying to create a Django management command with argparse, however whenever I run it, it always returns no such option which is valid, as this message comes from the manage.py:

class Command(BaseCommand):
 def handle(self, *args, **options):
 parser = argparse.ArgumentParser('Parsing arguments')
 parser.add_argument('--max', type=float, store)
 args = parser.parse_args(sys.argv[2:])

What would be the right way to use some argument parser with management commands?

Python version 2.x .

• mrpopo: It's worth noting that Django now uses argparse instead of optparse as of Django 1.8 docs.djangoproject.com/en/1.8/howto/custom-management-commands

Answer 1

In Django options are parsed with rules given in add_arguments method of BaseCommand. You should add your options to parser.add_argument, which use argparse lib like this:

class Command(BaseCommand):
 help = 'My cool command'
 def add_arguments(self, parser):
 # Named (optional) arguments
 parser.add_argument(
 '--max',
 action='store',
 dest='max',
 type='float',
 default=0.0,
 help='Max value'
 )
 def handle(self, *args, **options):
 print options['max']

• user2194805: Thanks, it' s fine, however a comma is missing. For later usage, can You please add it?

Answer 2

Instead, just modify the option_list, as suggested in docs:

from optparse import make_option
class Command(BaseCommand):
 option_list = BaseCommand.option_list + (
 make_option('--max',
 action='store',
 type='float',
 dest='max'), 
 )
 def handle(self, *args, **options):
 print options['max']

• user2194805: I think a comma and a parenthesis is missing from your code... . Anyway thanks!

Answer 3

According to the docs, custom options can be added in the add_arguments() method.

class Command(BaseCommand):
 def add_arguments(self, parser):
 # Positional arguments
 parser.add_argument('poll_id', nargs='+', type=int)
 # Named (optional) arguments
 parser.add_argument(
 '--delete',
 action='store_true',
 dest='delete',
 help='Delete poll instead of closing it',
 )
 def handle(self, *args, **options):
 # ...
 if options['delete']:
 poll.delete()
 # ...