Web Reference: Oct 4, 2025 · It automatically assigns a default value to keys that do not exist, which means you don’t have to manually check for missing keys and avoid KeyError. This example shows how a defaultdict automatically creates missing keys with a default empty list. The if/else example is looking up the key in the dictionary twice, while the default example might only be doing one lookup. Besides dictionary lookups potentially being costly in more extreme cases (where you probably shouldn't use Python to begin with), dictionary lookups are function calls too. In this step-by-step tutorial, you'll learn how the Python defaultdict type works and how to use it for handling missing keys when you're working with dictionaries. You'll also learn how to use a defaultdict to solve problems like grouping or counting the items in a sequence or collection.
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