hub.py 文件源码

def __init__(self, loop=None, default=None):
        greenlet.__init__(self)
        if hasattr(loop, 'run'):
            if default is not None:
                raise TypeError("Unexpected argument: default")
            self.loop = loop
        else:
            if default is None and get_ident() != MAIN_THREAD:
                default = False
            loop_class = _import(self.loop_class)
            if loop is None:
                loop = self.backend
            self.loop = loop_class(flags=loop, default=default)
        self._resolver = None
        self._threadpool = None
        self.format_context = _import(self.format_context)