If so, how should i then do it? As you have found, get just gets the value corresponding to a given key. If it already has a count for a given character, get.
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The get/set pattern provides a structure that allows logic to be added during the setting ('set') or retrieval ('get') of a property instance of an instantiated. Sorted will iterate through the iterable it's passed. The sample code in your question is clearly trying to count the number of occurrences of each character:
11 here is my solution.
As advised by andy e while answering this question, it's not good for your script's performance if it's repeatedly building.