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我创建了一个机器人，它与用户的推文交互并回复用户在 # 中发推文的位置的天气，例如“#London 的天气怎么样”。然后，该机器人将回复伦敦目前的天气情况。

当我运行机器人时，它运行良好并找到获取天气数据的 URL 并存储推文，但是当它需要回复天气时，我得到一个列表索引超出范围。

编码：

def get_location(tweet):
    #takes tweet and returns only the substring attached to hashtag
    tweet_location = [i.strip("#") for i in tweet.split() if i.startswith("#")][0]
    tweet_location += " today weather.com"
    return tweet_location

def get_weather(query):
    for url in search(query, stop=1):
        print("Results is " + url)

    #this code sends a request and reads the webpage enclsed to the request
    request = Request(url, headers={"User-Agent": "Mozilla/5.0"})

    webpage = urlopen(request).read()
    soup = BeautifulSoup(webpage, "html.parser")

    try:
        title = soup.findAll("span", "today-daypart-title")[0].string 
        phrase = soup.findAll("span", "today-daypart-wxphrase")[0].string
    except IndexError as e:
        forecast = (" could not find the weather, check back later")
        print(e)
    else:
        forecast = (" forecast for " + title + " is " + phrase)
        print(forecast)

    return forecast


def reply_to_tweet():
    print("retrieving and replying to tweets...")
    last_seen_tweet = read_last_seen(FILE_NAME)
    # mentions_timeline() returns a list of 20 most recent mentions
    mentions = api.mentions_timeline(last_seen_tweet, tweet_mode="extended")

    # reversing to read old tweets first
    for mention in reversed(mentions):
        print(str(mention.id) + " - " + mention.full_text)
        last_seen_tweet = mention.id
        store_last_seen(FILE_NAME, last_seen_tweet)
        if "#" in mention.full_text.lower():
            print("found #")

            location = get_location(mention.full_text)
            weather = get_weather(location)

            # responding to tweet mention
            api.update_status("@" + mention.user.screen_name + weather, mention.id)

运行代码的输出：

retrieving and replying to tweets...
1386417114316169219 - @UniProjectbot #Birmingham
found #
Results is https://weather.com/en-GB/weather/today/l/Birmingham+England?canonicalCityId=de781cf30dc9d9dbea1ed33096e3729fe38d4023bb06259589d311d034072b9d
list index out of range
4

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