<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def find_external_urls(self, entry):
 """ Find external URLs in an entry. """

        soup = BeautifulSoup(entry.html_content, 'html.parser')
        external_urls = [a['href'] for a in soup.find_all('a')
                         if self.is_external_url(
                             a['href'], self.ressources.site_url)]
        return external_urls