Bug report

Bug description:

statistics.mode uses collections.Counter so only works for data that are hashable

from statistics import mode
mode([{1,2},{1,2},{3}])

raisesTypeError: unhashable type: 'set'

Same issue with multimode.

This limitation is not mentioned in the docs or the docstring.

Potential solutions:

1. Add the fact that the function doesn't work on unhashable types to the documentation, and raise a StatisticsError if the user provides unhashable data
2. Come up with a separate algorithm for handling unhashable data. Would be interested to hear ideas on the appropriate algorithm.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Linked PRs

• gh-121977: Add tips for handling unhashable data #122075
• [3.13] gh-121977: Add tips for handling unhashable data (GH-122075) #122076
• [3.12] gh-121977: Add tips for handling unhashable data (GH-122075) #122077