怎么样使用该find()函数,它返回要搜索的单词的第一个字母的索引,否则会引发异常:x = "I want to try and select some specific thing in this world. Can you please help me do that"word = "specific"limit = 15try: index = x.find(word) output = x[max(0, index-limit):min(len(x), index+limit+len(word))] print(output)except: print("Word not found")哦,还有一个拼接字符串x[:]的方法,这是python调用子字符串的方法max 和 min 函数可防止子字符串的限制超出原始输入的长度