给定一段文字，删除其中的所有标点符号并统计每个单词出现的次数，最终将结果按单词出现次数从大到小排序输出。
“Hello, I'm a machine learning model, and I can help you with natural language processing!”
hello 1 
i'm 1 
a 1 
machine 1 
learning 1 
model 1 
and 1 
i 1 
can 1 
help 1 
you 1 
with 1 
natural 1 
language 1 
processing 1

按单词出现次数从大到小排序输出： 

1. 1 (所有单词都只出现了一次)