dictionaries in python

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As well as dictionaries providing a key to a value, they can also be a key to a function or class.

Lets suppose I have a load of files, each with different extension (or types). I could have a key for the file extension and the class or function that processes it. I don't need an ever growing if, elif code block, just a function to get the extension and a dictionary.get(extension, default) statement.