Parser kwargs no accepted

[ed2050]

The Crawler class takes a classname for the parser class, and a dict of parser_args to instantiate the parser:

class Crawler:
    def __init__(
        ...
        parser_cls=Parser,
        extra_parser_args=None,
        ...
    ):
        ...
        parser_kwargs = {} if extra_parser_args is None else extra_parser_args
        self.parser = parser_cls(parser_threads, self.signal, self.session, **parser_kwargs)

Yet the parser class doens't accept any kwargs. It's constructor is:

class Parser(ThreadPool):
    def __init__(self, thread_num, signal, session):

Why is this the case? It causes problems when passing extra kwargs. For example