CODEWITHSUNDEEP
pythondictionary
user2221667
user2221667

Reputation: 144

Sum continuously updating dictionary

I am monitoring a device that is continuously updating a dictionary that I would like to add the current and next update of each values in place (eventually to do averaging on the data). The problem is I end up appending to the same dictionary. I am having trouble trying to keep the current dictionary and the next dictionary in the same loop without making it complicated... 

data = {}

iteration 0:

data = { 'foo': [1,2,3], 'bar': [2,4,6]}

iteration 1:

data = { 'foo': [4,3,7], 'bar': [5,1,3]}

then sum both

datas = { 'foo': [5,5,10], 'bar':[7,5,9]}

and so on...

from collections import Counter
import random
import time

c = Counter()

def update_dict(data):
    c.update(data) #I want to take the current values and then add it to the next iteration of these values
    print dict(c)


while True:
    blah = {i: random.random() for i in range(5)}
    time.sleep(1)
    update_dict(blah)

I supposed I can append the updating dictionary to a list of dictionaries and add them all at some point and then clear the list...

Upvotes: 0

Views: 104

Answers (2)

Francis Potter
Francis Potter

Reputation: 1639

Something like this would collect the sums as in your example:

from itertools import zip_longest

data = {}

def update(new_data):
    for key in new_data:
        if key in data:
            z = zip_longest(data[key], new_data[key], fillvalue = 0)
            data[key] = [sum(i) for i in z]
        else:
            data[key] = new_data[key]

update({'foo': [1,2,3], 'bar': [2,4,6]})
update({'foo': [4,3,7], 'bar': [5,1,3]})

print(data)

Upvotes: 2

James
James

Reputation: 527

First, check to see if the key exists. If the key exists, then newList = [sum (a,b) for a,b in zip (data ('foo'),other_foo)]

Then update. Sorry for sloppy answer. Will fix later if necessary.

Upvotes: 1

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