CODEWITHSUNDEEP
pythonlistdictionary
Deepak
Deepak

Reputation: 739

Python Dictionary contains List as Value - How to update?

I have a dictionary which has value as a list.

dictionary = { 
               'C1' : [10,20,30] 
               'C2' : [20,30,40]
             }

Let's say I want to increment all the values in list of C1 by 10, how do I do it?

dictionary.get('C1') gives me the list but how do i update it?

Upvotes: 42

Views: 129039

Answers (6)

Loki
Loki

Reputation: 33

for i,j in dictionary .items():
    if i=='C1':
        c=[]
        for k in j:
            j=k+10
            c.append(j)
            dictionary .update({i:c})

Upvotes: 0

user5261053
user5261053

Reputation: 61

why not just skip .get altogether and do something like this?:

for x in range(len(dictionary["C1"]))
    dictionary["C1"][x] += 10

Upvotes: 1

Gabe
Gabe

Reputation: 86708

An accessed dictionary value (a list in this case) is the original value, separate from the dictionary which is used to access it. You would increment the values in the list the same way whether it's in a dictionary or not:

l = dictionary.get('C1')
for i in range(len(l)):
    l[i] += 10

Upvotes: 5

Paolo Bergantino
Paolo Bergantino

Reputation: 488384

>>> dictionary = {'C1' : [10,20,30],'C2' : [20,30,40]}
>>> dictionary['C1'] = [x+1 for x in dictionary['C1']]
>>> dictionary
{'C2': [20, 30, 40], 'C1': [11, 21, 31]}

Upvotes: 42

Utku Zihnioglu
Utku Zihnioglu

Reputation: 4873

dictionary["C1"]=map(lambda x:x+10,dictionary["C1"])

Should do it...

Upvotes: 4

girasquid
girasquid

Reputation: 15516

Probably something like this:

original_list = dictionary.get('C1')
new_list = []
for item in original_list:
  new_list.append(item+10)
dictionary['C1'] = new_list

Upvotes: 2

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