有没有办法用python从句子中删除专有名词？

import nltk
from nltk.tokenize import word_tokenize, PunktSentenceTokenizer
from nltk.tag import pos_tag

def remove_proper_nouns(sentence):
    # 使用PunktSentenceTokenizer对句子进行分句
    sentence_tokenizer = PunktSentenceTokenizer()
    sentences = sentence_tokenizer.tokenize(sentence)

    # 对每个句子进行词性标注
    tagged_sentences = [pos_tag(word_tokenize(sent)) for sent in sentences]

    # 删除专有名词
    cleaned_sentences = []
    for tagged_sentence in tagged_sentences:
        cleaned_sentence = [word for word, tag in tagged_sentence if tag != 'NNP' and tag != 'NNPS']
        cleaned_sentences.append(' '.join(cleaned_sentence))

    # 合并句子
    cleaned_text = ' '.join(cleaned_sentences)

    return cleaned_text

# 示例用法
sentence = "John works at Apple Inc. in California."
cleaned_sentence = remove_proper_nouns(sentence)
print(cleaned_sentence)