I want to receive a dict(str -> str)
argument from the command line. Does argparse.ArgumentParser
provide it? Or any other library?
For the command line:
program.py --dict d --key key1 --value val1 --key key2 --value val2
I expect the following dictionary:
d = {"key1": "val1", "key2": "val2"}
Here's another solution using a custom action, if you want to specify dict key pairs together comma-separated --
import argparse import sys parser = argparse.ArgumentParser(description='parse key pairs into a dictionary') class StoreDictKeyPair(argparse.Action): def __call__(self, parser, namespace, values, option_string=None): my_dict = {} for kv in values.split(","): k,v = kv.split("=") my_dict[k] = v setattr(namespace, self.dest, my_dict) parser.add_argument("--key_pairs", dest="my_dict", action=StoreDictKeyPair, metavar="KEY1=VAL1,KEY2=VAL2...") args = parser.parse_args(sys.argv[1:]) print args
Running:
python parse_kv.py --key_pairs 1=2,a=bbb,c=4 --key_pairs test=7,foo=bar
Output:
Namespace(my_dict={'1': '2', 'a': 'bbb', 'c': '4', 'test': '7', 'foo': 'bar'})
If you want to use nargs instead of comma-separated values in string:
class StoreDictKeyPair(argparse.Action): def __init__(self, option_strings, dest, nargs=None, **kwargs): self._nargs = nargs super(StoreDictKeyPair, self).__init__(option_strings, dest, nargs=nargs, **kwargs) def __call__(self, parser, namespace, values, option_string=None): my_dict = {} print "values: {}".format(values) for kv in values: k,v = kv.split("=") my_dict[k] = v setattr(namespace, self.dest, my_dict) parser.add_argument("--key_pairs", dest="my_dict", action=StoreDictKeyPair, nargs="+", metavar="KEY=VAL") args = parser.parse_args(sys.argv[1:]) print args
Running
python arg_test4.py --key_pairs 1=2 a=bbb c=4 test=7 foo=bar
Outputs:
values: ['1=2', 'a=bbb', 'c=4', 'test=7', 'foo=bar'] Namespace(my_dict={'1': '2', 'a': 'bbb', 'c': '4', 'test': '7', 'foo': 'bar'})
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With