def coroutine_frames(all_frames):
    """Extract coroutine boilerplate frames from a frame list

    for better stack/traceback printing of coroutines
    """
    useful_frames = []
    for frame in all_frames:
        if frame[0] == '<string>' and frame[2] == 'raise_exc_info':
            continue
        # start out conservative with filename + function matching
        # maybe just filename matching would be sufficient
        elif frame[0].endswith('tornado/gen.py') and frame[2] in {
            'run',
            'wrapper',
            '__init__',
        }:
            continue
        elif frame[0].endswith('tornado/concurrent.py') and frame[2] == 'result':
            continue
        useful_frames.append(frame)
    return useful_frames
Extract coroutine boilerplate frames from a frame list

for better stack/traceback printing of coroutines
jupyterhub/log.py