How do you convert a dictionary to a defaultdict?

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What are the advantages of using a defaultdict instead of a regular dictionary?
Jul 2 in Python by Waseem
• 4,480 points
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1 answer to this question.

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from collections import defaultdict
a = {1: 2, 2: 3, 3: 4}
d = defaultdict(int,a)
answered Aug 2 by Mohammad
• 3,060 points

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