如何在Python中计算段落中的句子数量？

Question

这是我目前的进展，但我的段落只有5个句号，所以只有5句话。可是它却一直返回14作为答案。有人能帮忙吗？？

file = open ('words.txt', 'r')
lines= list (file)
file_contents = file.read()
print(lines)
file.close()
words_all = 0
for line in lines:
    words_all = words_all + len(line.split())
    print ('Total words:   ', words_all)
full_stops = 0
for stop in lines:
    full_stops = full_stops + len(stop.split('.'))
print ('total stops:    ', full_stops)

这里是文本文件

图灵机是一种设备，它根据一张规则表在一条带子上操作符号。尽管它的设计很简单，图灵机可以被调整来模拟任何计算机算法的逻辑，特别是在解释计算机内部CPU的功能时非常有用。“图灵”机是由艾伦·图灵在1936年描述的，他称之为“自动机”。图灵机并不是为了作为一种实用的计算技术，而是作为一个假设的设备，代表计算机的工作原理。图灵机帮助计算机科学家理解机械计算的局限性。

Answer 1

使用正则表达式。

In [13]: import re
In [14]: par  = "This is a paragraph? So it is! Ok, there are 3 sentences."
In [15]: re.split(r'[.!?]+', par)
Out[15]: ['This is a paragraph', ' So it is', ' Ok, there are 3 sentences', '']

Answer 2

最简单的方法就是这样做：

import nltk
nltk.download('punkt')
from nltk.tokenize import sent_tokenize

sentences = 'A Turning machine is a device that manipulates symbols on a strip of tape according to a table of rules. Despite its simplicity, a Turing machine can be adapted to simulate the logic of any computer algorithm, and is particularly useful in explaining the functions of a CPU inside a computer. The "Turing" machine was described by Alan Turing in 1936, who called it an "a(utomatic)-machine". The Turing machine is not intended as a practical computing technology, but rather as a hypothetical device representing a computing machine. Turing machines help computer scientists understand the limits of mechaniacl computation.'

number_of_sentences = sent_tokenize(sentences)

print(len(number_of_sentences))

输出结果：

5

Answer 3

如果一行里没有句号，split 函数会返回一个元素，就是这一整行的内容：

>>> "asdasd".split('.')
    ['asdasd']

所以你是在统计行数加上句号的数量。那你为什么要把文件分成一行一行的呢？

with open('words.txt', 'r') as file:
    file_contents = file.read()

    print('Total words:   ', len(file_contents.split()))
    print('total stops:    ', file_contents.count('.'))