Python 类型错误：“设置”对象不可下标
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TypeError: 'set' object is not subscriptable
提问by Tagc
my flask application gives a 'set' error I have been coding a RSS feed web app but currently am having an error that I cant figure out; this is my code :
我的 Flask 应用程序出现“设置”错误 这是我的代码：
import feedparser
from flask import Flask
from flask import render_template
app = Flask(__name__)
RSS = {"http://feeds.bbci.co.uk/news/rss.xml",
"http://rss.iol.io/iol/news", "http://feeds.foxnews.com/foxnews/latest", "http://rss.cnn.com/rss/edition.rss"}
#error occurs here
@app.route("/")
@app.route("/<publication>")
def get_news(publication="bbc"):
#ERROR OCCURS HERE
feed = feedparser.parse(RSS[publication])
first_article = feed['entries'][0]
return render_template("home.html",
title=first_article.get("title"),
published=first_article.get("publication"),
summary=first_article.get("summary"))
if __name__ == "__main__":
app.run(debug=True, port=5000)
I get my error at these two lines
我在这两行出现错误
feed = feedparser.parse(RSS[publication])
first_article = feed['entries'][0]
can't figure out the actual error
无法弄清楚实际错误
回答by Tagc
As Iron Fist points out, RSSis a set (which aren't subscriptable), although it looks as though you're trying to use it as a dictionary. Based on the default value you use for get_news, I'm hazarding a guess that you want something like this:
正如 Iron Fist 所指出的，RSS是一个集合（不可下标），尽管它看起来好像您正试图将其用作字典。根据您使用的默认值get_news，我冒昧地猜测您想要这样的东西：
RSS = {"bbc": "http://feeds.bbci.co.uk/news/rss.xml",
"iol": "http://rss.iol.io/iol/news",
"fox": "http://feeds.foxnews.com/foxnews/latest",
"cnn": "http://rss.cnn.com/rss/edition.rss"}
回答by Tagc
As Iron Fist comments, it seems that you are defining a set and using it as dictionary. It's difficult to be sure, but for what I see in the code, RSS should actually be a dictionary, using the name of the feeder as key. So:
正如 Iron Fist 评论的那样，您似乎正在定义一个集合并将其用作字典。很难确定，但就我在代码中看到的而言，RSS 实际上应该是一个字典，使用 feeder 的名称作为关键字。所以：
RSS = {"bbc":"http://feeds.bbci.co.uk/news/rss.xml",
"iol":"http://rss.iol.io/iol/news",
"foxnews":"http://feeds.foxnews.com/foxnews/latest",
"cnn":"http://rss.cnn.com/rss/edition.rss"}
