python正则表达式：如何从字符串中删除所有标点字符但保留数字之间的字符串？

I am working on a Chinese NLP project. I need to remove all punctuation characters except those characters between numbers and remain only Chinese character(\u4e00-\u9fff),alphanumeric characters(0-9a-zA-Z).For example,the hyphen in 12-34 should be kept while the equal mark after 123 should be removed.I am working on a Chinese NLP project. I need t