Memo to ask for KPI with python

per_day   = dict()  #Make a dict from initialization
user = []　#Make an array from.
for payment_log in PaymentLog.all()[:SAMPLING_NUM]:#Repeat 10 times.
    payment_log = filter_values_for_print(payment_log)
    price= payment_log['price']
    per_day["price"] = per_day.get("price", 0) + price #Add more and more price to the initial value of price.=
    print per_day["price"] #The total sales are displayed
    user_id = payment_log['user_id']
    user += [user_id] #If you can't put parentheses, the display will be disjointed.
    print per_day["price"] /len(user)

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