argument_parser_shorter.py

class ArgumentParser:
    def __init__(self, args):
        self.positioned_arguments = list(filter(lambda x: not x.startswith('--'), args))
        self.named_argument_map = dict(map(lambda x: x.split("=", 1) if "=" in x else (x, None),
                                           filter(lambda x: x.startswith('--'), args)))

    def get(self, key_or_index):
        if type(key_or_index) is int:
            return self.positioned_arguments[key_or_index]
        else:
            return self.named_argument_map[str(key_or_index)]

    def has_key(self, key):
        return key in self.named_argument_map