ImportError: cannot import name ‘…’ from ‘collections’ using Python 3.10
Change: from collections import Mapping to from collections.abc import Mapping
python-collections
How to initialize defaultdict with keys?
From the comments, I’m assuming you want a dictionary that fits the following conditions: Is initialized with set of keys with an empty list value for each Has defaultdict behavior that can initialize an empty list for non-existing keys @Aaron_lab has the right method, but there’s a slightly cleaner way: d = defaultdict(list,{ k:[] for … Read more
ImportError: cannot import name ‘Mapping’ from ‘collections’ using Python 3.10
Change: from collections import Mapping to from collections.abc import Mapping
Python collections.Counter: most_common complexity
From the source code of collections.py, we see that if we don’t specify a number of returned elements, most_common returns a sorted list of the counts. This is an O(n log n) algorithm. If we use most_common to return k > 1 elements, then we use heapq.nlargest. This is an O(k) + O((n – k) … Read more
in VS Code ImportError: cannot import name ‘Mapping’ from ‘collections’
As Mitra said above, change: from collections import Mapping to from collections.abc import Mapping