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The other is to store values to match as keys in a dictionary, then use the values to take an action—e.g., store a function as a value and use the key or some other variable as input.

Best Python text editors By default, Python files (ending in .py) will open in TextEdit, and this won’t do. It has a nasty habit of a writing files in non-ASCII format, which messes things up.

In this case, we use default to set weight to 0.0. default_factory: Provides the name of a function, which takes no parameters, that returns some object to serve as the default value for the field.