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. As you have found, get just gets the value corresponding to a given key. The sample code in your question is clearly trying to count the number of occurrences of each character:
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If it already has a count for a given character, get. Never use get and use post never use post and use get it doesn't matter which one. Sorted will iterate through the iterable it's passed.
If so, how should i then do it?
From what i can gather, there are three categories: