Where Each Word Appears — hard Python for AI problem | Incognition

Where Each Word Appears

10 pts · 10 coins

Python for AIHard

Where Each Word Appears

You're building a tiny search index for a list of sentences. Sentences are numbered from 1.

Write word_index(sentences). It returns a dictionary of word → list of sentence numbers that contain it.

Split each sentence on spaces and treat words as lowercase.
Each sentence number appears at most once per word, even if the word is used twice in that sentence.
Each list of numbers goes from smallest to largest.
Words appear in the dictionary in the order they are first seen.

Examples

sentences = ["The cat sat", "the dog"]

returns {'the': [1, 2], 'cat': [1], 'sat': [1], 'dog': [2]}

sentences = []

returns {}

Hints

solution.py

1def word_index(sentences):
2    # your code here
3    pass
4