import re
f = open('作业一素材.txt', mode='r', encoding='utf-8')
txt = f.read()
lines = txt.splitlines()
sentence = lines[-3]
word_0 = re.split("\s", sentence)
word_1 = word_0[-1]
word_2 = re.split(r'[.]', word_1)
word = word_2[0]
key = len(word)
print(key)
下载原文件,用re中的函数splitlines进行文本拆分,由于不包含页脚,选取倒数第三行后按空格进行拆分,再分割标点符号和单词,最后计算出长度。