- defaultdict will automatically create a dictionary for you that has keys which are the integers 0-10.
- defaultdict forces a dictionary to only accept keys that are of the types specified when you created the defaultdict (such as strings or integers).
- If you try to read from a defaultdict with a nonexistent key, a new default key-value pair will be created for you instead of throwing a KeyError.
- defaultdict stores a copy of a dictionary in memory that you can default to if the original gets unintentionally modified.
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