如何在Python中保留仅包含特定字母的句子

import re

def keep_only_letters(sentence):
    # 使用正则表达式匹配只包含字母的单词
    pattern = re.compile(r'[a-zA-Z]+')
    words = pattern.findall(sentence)
    
    # 将匹配到的单词重新组合成句子
    new_sentence = ' '.join(words)
    
    return new_sentence

# 示例用法
sentence = "Hello, 123! This is a sentence with some numbers."
new_sentence = keep_only_letters(sentence)
print(new_sentence)

Hello This is a sentence with some numbers