having dictionary and list to iterate in for loop

[Mekire]

 for i, k in enumerate(dic.keys()):     
    dic[k] = dic[k] + ls[i] 

As you can't rely on the order of the dict, this is not guaranteed to give the desired result.
You would need to sort the keys to guarantee behavior with this method.
Honestly if you want to add values from a sequence where the values correspond to keys it would make more sense if both were dicts.