实时监测文件内容的变化，每当有新一行数据写入文件后，分析该行是否包含有要寻找的关键词，若有，则触发。

import time
from fuzzywuzzy import fuzz

KEY = r'要寻找的关键词'
threshold = 90

if __name__ == '__main__':
    path = r'sample.txt'
    file = open(path)

    # 将每次从文件最后一行开始读
    # 如果没有这一行，就会每次启动程序后从文件最开始地方读
    file.seek(0, 2)

    while True:
        where = file.tell()
        line = file.readline()
        if not line:
            time.sleep(1)
            file.seek(where)
        else:
            pr = fuzz.partial_ratio(line, KEY)
            if pr > threshold:
                print(line)