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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 increment_key(key):
 """ given a key increment the value """

    pipe = REDIS_SERVER.pipeline()
    pipe.incr(key, 1)
    if config.COOLOFF_TIME:
        pipe.expire(key, config.COOLOFF_TIME)
    new_value = pipe.execute()[0]
    return new_value