Watch for exam results announcement and notify via telegram-middleman-bot (run as Cronjob)

zar-watcher.py

import requests
import os

url = 'http://www.zar.kit.edu/rss/feed.rss'
keywords = ['steuerrecht']
cache_file = 'cache.txt'
hook_url = 'http://middleman.ferdinand-muetsch.de/api/messages'
hook_sender_id = 'Watcher'
hook_recipient_id = ''

def callback(keyword):
    json_data = {
        'recipient_token': hook_recipient_id,
        'origin': hook_sender_id,
        'text': 'Found word *{}* at [{}]({})'.format(keyword, url, url)
    }
    requests.post(hook_url, json=json_data)

if __name__ is '__main__':
    text_new, text_old = '', ''
    if not os.path.exists(cache_file): open(cache_file, 'a', encoding='utf8').close()

    with open(cache_file, 'r', encoding='utf8') as f:
        text_old = f.read()
        r = requests.get(url)
        text_new = r.text.lower()
        for k in keywords:
            if k.lower() in text_new and not k.lower() in text_old:
                callback(k)
                break

    with open(cache_file, 'w', encoding='utf8') as f:
        f.write(text_new)