有没有办法用 Tweepy 索引推文？

Question

我正在尝试编写一个 Twitter 机器人脚本，该机器人将响应其中包含方程式的提及。首先，我让提及工作（它会回应任何提及它的人）。然后，我尝试实现使用正则表达式的数学函数（我已经创建了这个，它只是将它集成到主机器人程序中的一种手段）。

提及代码：

import mathbotcreds as mtc
import logging
import re
import tweepy
from time import sleep as wait

auth = tweepy.OAuthHandler(mtc.CONSUMER_KEY, mtc.CONSUMER_SECRET)
auth.set_access_token(mtc.ACCESS_TOKEN, mtc.ACCESS_SECRET)

api = tweepy.API(auth, wait_on_rate_limit=True,
                 wait_on_rate_limit_notify=True,
                 retry_count=2)

try:
    api.verify_credentials()
    print("Authentication Successful!")
except:
    print("Error during authentication! :(")
    
mentions = api.mentions_timeline()
pattern = r'([0-9]+.*[-+*/%].*[0-9]+)+' 

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger()

def check_mentions(api, since_id):
    logger.info("Collecting mentions... ")
    new_since_id = since_id
    for tweet in tweepy.Cursor(api.mentions_timeline, since_id=since_id).items():
        new_since_id = max(tweet.id, new_since_id)
        
        if tweet.in_reply_to_status_id is not None:
            continue
        
            api.update_status(
                status=f"Hello! \n\nIt worked! \nYay! ^-^ \n\n (You said: \"{tweet.text}\".)",
                in_reply_to_status_id=tweet.id) 
        
    return new_since_id

def main():
    since_id = 1
    while True:
        since_id = check_mentions(api, since_id)
        logger.info("Waiting... ")
        wait(15) 
        
if __name__ == "__main__":
    logger.info("Running script... ")
    wait(1) 
    main()
    
# for m in mentions:
#     api.update_status(f"@{m.user.screen_name} Hello! \nYou said: \n{m.text}", m.id)
#     wait(15) 

---

提及代码和方程函数：

import mathbotcreds as mtc
import logging
import re
import tweepy
from time import sleep as wait

auth = tweepy.OAuthHandler(mtc.CONSUMER_KEY, mtc.CONSUMER_SECRET)
auth.set_access_token(mtc.ACCESS_TOKEN, mtc.ACCESS_SECRET)

api = tweepy.API(auth, wait_on_rate_limit=True,
                 wait_on_rate_limit_notify=True,
                 retry_count=2)

try:
    api.verify_credentials()
    print("Authentication Successful!")
except:
    print("Error during authentication! :(")
    
mentions = api.mentions_timeline()
pattern = r'([0-9]+.*[-+*/%].*[0-9]+)+' 

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger()

def check_mentions(api, since_id):
    logger.info("Collecting mentions... ")
    new_since_id = since_id
    for tweet in tweepy.Cursor(api.mentions_timeline, since_id=since_id).items():
        match = re.search(pattern, tweet.text)
        equation = tweet.text[match.start():match.end()] 
        new_since_id = max(tweet.id, new_since_id)
        
        if tweet.in_reply_to_status_id is not None:
            continue
        
        if match:
            ans = eval(tweet.text[match.start():match.end()]) 
            api.update_status(
                status=f"The answer to {str(equation)} is {ans}. ",
                in_reply_to_status_id=tweet.id)
        elif not match:
            api.update_status(
                status=f"Hello! \n\nIt worked! \nYay! ^-^ \n\n (You said: \"{tweet.text}\".)",
                in_reply_to_status_id=tweet.id) 
        
    return new_since_id

def main():
    since_id = 1
    while True:
        since_id = check_mentions(api, since_id)
        logger.info("Waiting... ")
        wait(15) 
        
if __name__ == "__main__":
    logger.info("Running script... ")
    wait(1) 
    main()
    
# for m in mentions:
#     api.update_status(f"@{m.user.screen_name} Hello! \nYou said: \n{m.text}", m.id)
#     wait(15) 

当我运行它时，我收到一条错误消息，指出 AttributeError: 'NoneType' object has no attribute 'start' 在 eval() 函数 (equation = tweet.text[match.start():match.end()]) 上。我已经研究了这个以及如何索引推文文本（使用 Tweepy）。如果我在eval() 函数的正上方有一个函数，我很困惑为什么会收到NoneType 错误。这不应该抓住吗？为什么会这样？

谢谢！

Answer 1

re.search 在找不到匹配项时返回NoneType。您应该在使用它之前检查返回值，如下所示：

match = re.search(pattern, tweet.text)
if match:
    equation = tweet.text[match.start():match.end()]