download.py 文件源码

def _read_timeout(cnt, timeout_ms=2000):
    time_support = "ticks_ms" in dir(time)
    s_time = time.ticks_ms() if time_support else 0
    data = sys.stdin.read(cnt)
    if len(data) != cnt or (time_support and time.ticks_diff(time.ticks_ms(), s_time) > timeout_ms):
        return None
    return data