nameerror name 'defaultdict' is not defined 1

nameerror name ‘defaultdict’ is not defined

You're not importing defaultdict. Do either:

from collections import defaultdict
or

import collections
d = collections.defaultdict(list)

Here is what the above code is Doing:
1. Create a defaultdict with a default value of list.
2. Iterate over the list of words.
3. For each word, sort the letters in the word.
4. Use the sorted word as a key in the defaultdict.
5. Append the word to the list of words associated with that key.
6. Print the list of words associated with each key.

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