Programming walkthroughs: Coding with Python and Repl.it by Ritza

Author:Ritza [Ritza]
Language: eng
Format: epub, pdf
Publisher: leanpub.com
Published: 2020-11-25T00:00:00+00:00

Feedparser does most of the heavy lifting for us, so we don’t have to get too close to the slightly cumbersome XML format. In the code above, we parse the feed into a nice Python representation (line 4), loop through all of the entries (the <item> entries from the XML we looked at earlier), and print out the link elements.

If you run this code, you should see a few dozen URLs output on the right pane, as in the image below.

Image: 5

Setting up a web application with Flask

We don’t just want to print this data out in the Repl console. Instead, our application should return information to anyone who uses a web browser to visit our application. We’ll, therefore, install the lightweight web framework Flask and use this to serve web content to our visitors.

In the main.py file, we need to modify our code to look as follows:

1 import feedparser 2 from flask import Flask 3 4 app = Flask(__name__) 5 6 BBC_FEED = "http://feeds.bbci.co.uk/news/world/rss.xml" 7 8 @app.route("/") 9 def home(): 10 feed = feedparser.parse(BBC_FEED) 11 urls = [] 12 13 for article in feed['entries']: 14 urls.append(article['link']) 15 16 return str(urls) 17 18 19 if __name__ == '__main__': 20 app.run('0.0.0.0')

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