The sample code in your question is clearly trying to count the number of occurrences of each character: Never use get and use post never use post and use get it doesn't matter which one. From what i can gather, there are three categories:
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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. If so, how should i then do it?
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.
