CODEWITHSUNDEEP
pythonpython-3.x
nad
nad

Reputation: 2850

Python Dictionary contains List as Value - How to update based on some other input

I have a python dictionary where the value is a 2 item list. The first item is a count of how many times I have seen the key. The 2nd item is another integer which I need to update based on some input.

dictionary = { 
               'key1' : [1, 200] 
               'key2' : [1, 100]
             }

Suppose, I encounter key1 again and the input is 150. So the update operation should yield

dictionary = { 
                   'key1' : [2, 350] 
                   'key2' : [1, 100]
                 }

How do I do it? I saw this post but doesn't help. Please suggest. I am using Python 3.

EDIT:

Before posting this, I tried below:

data = defaultdict(list)
key = requestTokens[1] # one of the input that works as a key
data[key][0] +=1
data[key][1] += int(statusTokens[1]) #another input is statusTokens[1] a string

But I am getting error

data[key][0] +=1
IndexError: list index out of range

Upvotes: 0

Views: 2081

Answers (1)

Michaela Ervin
Michaela Ervin

Reputation: 740

>>> di = {'key1': [1,200], 'key2':[1,100]}
>>> di
{'key1': [1, 200], 'key2': [1, 100]}
>>> di['key1'][0] += 1
>>> di['key1'][1] += 150
>>> di
{'key1': [1, 300], 'key2': [1, 100]}
>>>

So looking at the above example you can see that it is first accessing the key then the index in the array and setting it to a new value. di['key1'][0] += 1 is incrementing it by 1 di['key1'][1] += 150 is adding the new value

Upvotes: 3

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