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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def get_time_at(time_in=None, time_at=None, out_fmt='%Y-%m-%dT%H:%M:%S'):
    '''
    Return the time in human readable format for a future event that may occur
    in ``time_in`` time, or at ``time_at``.
    '''
    dt = get_timestamp_at(time_in=time_in, time_at=time_at)
    return time.strftime(out_fmt, time.localtime(dt))