Python 错误:“NoneType"对象没有属性“find_all" [英] Python error: 'NoneType' object has no attribute 'find_all'

问题描述

我正在改编一个网页抓取程序，http://danielfrg.com/blog/2013/04/01/nba-scraping-data/#disqus_thread，将 ESPN 的棒球数据抓取到 CSV 中.但是，当我运行第二段代码来编写 csv 游戏时，我从以下代码部分中得到NoneType"对象没有属性find_all"错误

I'm adapting a web scraping program from, http://danielfrg.com/blog/2013/04/01/nba-scraping-data/#disqus_thread, to scrape ESPN for baseball data into a CSV. However when I run the second piece of code to write a csv of games I get the 'NoneType' object has no attribute 'find_all' error, from the following section of code

for index, row in teams.iterrows():
    _team, url = row['team'], row['url']
    r = requests.get(BASE_URL.format(row['prefix_1'], year, row['prefix_2']))
    table = BeautifulSoup(r.text).table
    for row in table.find_all("tr")[1:]: # Remove header
        columns = row.find_all('td')
        try:
            _home = True if columns[1].li.text == 'vs' else False
            _other_team = columns[1].find_all('a')[1].text
            _score = columns[2].a.text.split(' ')[0].split('-')
            _won = True if columns[2].span.text == 'W' else False

            match_id.append(columns[2].a['href'].split('?id=')[1])
            home_team.append(_team if _home else _other_team)
            visit_team.append(_team if not _home else _other_team)
            d = datetime.strptime(columns[0].text, '%a, %b %d')
            dates.append(date(year, d.month, d.day))

我可以发布整个程序，但这是编译器读取错误的代码段.

I can post the whole program but this is the piece of code the compiler reads the error for.

完整的错误文本是

Traceback (most recent call last):
  File "C:Python27Project FilesGame Parser.py", line 23, in <module>
    for row in table.find_all("tr")[1:]: # Remove header
AttributeError: 'NoneType' object has no attribute 'find_all'

任何有关如何运行此代码的帮助将不胜感激.

Any help on how to get this code running would be greatly appreciated.

推荐答案

该错误意味着您正在构建的 table 变量:

The error means that the table variable that you are building by doing:

table = BeautifulSoup(r.text).table

正在返回 None.并且 for row in table.find_all("tr")[1:]: 在 None 上抛出错误.

is returning None. And for row in table.find_all("tr")[1:]: on a None is throwing the error.

您可以检查有问题的 url 是否有您尝试访问的表格.您可以通过打印出由该语句构造的 url 来实现:

You can check if the url in question has a table in the way you are trying to access it. You can do this by printing out the url constructed by this statement:

BASE_URL.format(row['prefix_1'], year, row['prefix_2'])

然后在浏览器中转到此网址以检查它是否包含您感兴趣的表格.

and then going to this url in your browser to check if it has the table of your interest.

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