Here the get method finds a key entry for 'e' and finds its value which is 1. We add this to the other 1 in characters.get (character, 0) + 1 and get 2 as result. When we apply this in the characters [character] = characters.get (character, 0) + 1 equation: ... It should be clear that the last equation assigns a new value 2 to the already ...
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As you have found, get just gets the value corresponding to a given key. sorted will iterate through the iterable it's passed. In this case that iterable is a dict, and iterating through a dict just iterates through its keys. If you want to sort based on the values instead, you need to transform the keys to their corresponding values, and of course the obvious way to do this is with get. To ...
Ultimately it probably doesn't have a safe .get method because a dict is an associative collection (values are associated with names) where it is inefficient to check if a key is present (and return its value) without throwing an exception, while it is super trivial to avoid exceptions accessing list elements (as the len method is very fast). The .get method allows you to query the value ...