test_utils.py 文件源码

def __init__(self, gen=None):
        super().__init__()

        if gen is None:
            def gen():
                yield
            self._check_on_close = False
        else:
            self._check_on_close = True

        self._gen = gen()
        next(self._gen)
        self._time = 0
        self._clock_resolution = 1e-9
        self._timers = []
        self._selector = TestSelector()

        self.readers = {}
        self.writers = {}
        self.reset_counters()

        self._transports = weakref.WeakValueDictionary()