def mean(data):

    if len(data) < 1:
        return None

    return float(sum(data)) / len(data)
get the feed that contains the sum of all activity
dataset/ETHPy150Open yvesalexandre/bandicoot/bandicoot/helper/tools.py/mean--crossover with--dataset/ETHPy150Open tschellenbach/Stream-Framework/stream_framework/feed_managers/base.py/Manager.get_feeds