JSON for quick config file

jsonconfigparser.py

class JSONConfigParser():
    import collections
    Option = collections.namedtuple('Option', 'type is_required default')

    def __init__(self):
        self._expected = {}

    def add_option(self, option, type, is_required=False, default=None):
        self._expected[option] = self.Option(type, is_required, default)

    def parse(self, file):

        with open(file, 'r') as f:
            config = json.load(f)

        out = {}
        for k, v in self._expected.items():
            if k in config:
                v2 = config[k]
                if isinstance(v2, v.type):
                    out[k] = v2
                else:
                    raise TypeError(f"Option {k} should be of type {v.type}")
            elif v.is_required:
                raise ValueError(
                    f'JSON is missing option {k} of type {v.type}'
                )
            else:
                out[k] = v.default

        return out