如何使用python查找单词在句子中的位置？

def find_word_positions(sentence, word):
    words = sentence.split()
    positions = []
    for index, w in enumerate(words):
        if w == word:
            positions.append(index)
    return positions

sentence = "I love Python, Python is a powerful programming language."
word = "Python"
positions = find_word_positions(sentence, word)
print("The word '{}' appears at positions: {}".format(word, positions))

The word 'Python' appears at positions: [1, 4]