Python：从行提取句子 – 基于标准需要正则表达式

这里有点Python/编程新手……

我试图想出一个正则表达式,它可以处理从文本文件中的一行中提取句子,然后将它们附加到列表中.代码：

import re

txt_list = []

with open('sample.txt','r') as txt:
    patt = r'.*}[.!?]s?n?|.*}.+[.!?]s?n?'
    read_txt = txt.readlines()

    for line in read_txt:
        if line == "n":
            txt_list.append("n")
        else: 
            found = re.findall(patt,line)
            for f in found:
                txt_list.append(f)


for line in txt_list:
    if line == "n":
        print "newline"
    else:
        print line

根据上述代码的最后5行打印输出：

{Hello there|Hello|Howdy} Dr. Munchauson you {gentleman|fine fellow}! 
What {will|shall|should} we {eat|have} for lunch? Peas by the {thousand|hundred|1000} said Dr. Munchauson; {that|is} what he said.

newline
I am the {very last|last} sentence for this {instance|example}.

‘sample.txt’的内容：

{Hello there|Hello|Howdy} Dr. Munchauson you {gentleman|fine fellow}! What {will|shall|should} we {eat|have} for lunch? Peas by the {thousand|hundred|1000} said Dr. Munchauson; {that|is} what he said.

I am the {very last|last} sentence for this {instance|example}.

我现在已经玩了几个小时的正则表达式,我似乎无法破解它.因为它的正则表达在午餐结束时不匹配？因此这两句话我们午餐时会吃什么{会|应该}？蚕豆通过{千| 1000}表示,Munchauson博士; {那是}他说的话.不分开;这就是我想要的.

正则表达式的一些重要细节：

>每个句子总是以句号,感叹号或问号结束
>每个句子总是包含至少一对大括号“{}”,其中包含一些单词.此外,不会产生误导性的“.”在每个句子的最后一个括号之后.因此,博士将始终位于每个句子中最后一对花括号之前.这就是为什么我试图使用’}’来建立我的正则表达式.这样我可以避免使用异常方法,为Dr.,Jr.,about等语法创建例外.等等.对于我运行此代码的每个文件,我个人确保在任何句子中的最后一个’}’之后没有“误导期”.

我想要的输出是这样的：

{Hello there|Hello|Howdy} Dr. Munchauson you {gentleman|fine fellow}! 
What {will|shall|should} we {eat|have} for lunch?
Peas by the {thousand|hundred|1000} said Dr. Munchauson; {that|is} what he said.

newline
I am the {very last|last} sentence for this {instance|example}.