Python Dictionary contains List as Value - How to update?

Question

I have a dictionary which has value as a list.

dictionary = { 
               \'C1\' : [10,20,30] 
               \'C2\' : [20,30,40]
             }
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Answer 1

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

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