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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def parse_feed(content):
 """ utility function to parse feed """

        feed = feedparser.parse(content)
        articles = []
        for entry in feed['entries']:
            article = {
                'title': entry['title'],
                'link': entry['link']
            }
            try:
                article['media'] = entry['media_content'][0]['url']
            except KeyError:
                article['media'] = None
            articles.append(article)
        return articles