steven.beth...@gmail.com made a very nice module for me to enhance argparse
called argparse_bool.py, which contains ConfigureAction. This will allow a
boolean value to be set very like the gnu configure style:
--foo
--with-foo
--without-foo
--no-foo
--foo=yes
--foo=no
I've been happily using it, and I think it would be of sufficient general
interest to include it with the standard library.
import argparse
import re
def boolean(string):
string = string.lower()
if string in ['0', 'f', 'false', 'no', 'off']:
return False
elif string in ['1', 't', 'true', 'yes', 'on']:
return True
else:
raise ValueError()
class ConfigureAction(argparse.Action):
def __init__(self,
option_strings,
dest,
default=None,
required=False,
help=None,
metavar=None,
positive_prefixes=['--', '--with-', '--enable-'],
negative_prefixes=['--no-', '--without-', '--disable-']):
strings = []
self.positive_strings = set()
self.negative_strings = set()
for string in option_strings:
assert re.match(r'--[A-z]+', string)
suffix = string[2:]
for positive_prefix in positive_prefixes:
self.positive_strings.add(positive_prefix + suffix)
strings.append(positive_prefix + suffix)
for negative_prefix in negative_prefixes:
self.negative_strings.add(negative_prefix + suffix)
strings.append(negative_prefix + suffix)
super(ConfigureAction, self).__init__(
option_strings=strings,
dest=dest,
nargs='?',
const=None,
default=default,
type=boolean,
choices=None,
required=required,
help=help,
metavar=metavar)
def __call__(self, parser, namespace, value, option_string=None):
if value is None:
value = option_string in self.positive_strings
elif option_string in self.negative_strings:
value = not value
setattr(namespace, self.dest, value)
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('--fun', action=ConfigureAction)
assert parser.parse_args([]).fun == None
assert parser.parse_args(['--fun']).fun == True
assert parser.parse_args(['--with-fun']).fun == True
assert parser.parse_args(['--enable-fun']).fun == True
assert parser.parse_args(['--no-fun']).fun == False
assert parser.parse_args(['--without-fun']).fun == False
assert parser.parse_args(['--disable-fun']).fun == False
print parser.parse_args()
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