📄 listing23-2.py
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from nntplib import NNTPfrom time import strftime, time, localtimefrom email import message_from_stringfrom urllib import urlopenimport textwrapimport reday = 24 * 60 * 60 # Number of seconds in one daydef wrap(string, max=70): """ Wraps a string to a maximum line width. """ return '\n'.join(textwrap.wrap(string)) + '\n'class NewsAgent: """ An object that can distribute news items from news sources to news destinations. """ def __init__(self): self.sources = [] self.destinations = [] def addSource(self, source): self.sources.append(source) def addDestination(self, dest): self.destinations.append(dest) def distribute(self): """ Retrieve all news items from all sources, and Distribute them to all destinations. """ items = [] for source in self.sources: items.extend(source.getItems()) for dest in self.destinations: dest.receiveItems(items)class NewsItem: """ A simple news item consisting of a title and a body text. """ def __init__(self, title, body): self.title = title self.body = bodyclass NNTPSource: """ A news source that retrieves news items from an NNTP group. """ def __init__(self, servername, group, window): self.servername = servername self.group = group self.window = window def getItems(self): start = localtime(time() - self.window*day) date = strftime('%y%m%d', start) hour = strftime('%H%M%S', start) server = NNTP(self.servername) ids = server.newnews(self.group, date, hour)[1] for id in ids: lines = server.article(id)[3] message = message_from_string('\n'.join(lines)) title = message['subject'] body = message.get_payload() if message.is_multipart(): body = body[0] yield NewsItem(title, body) server.quit()class SimpleWebSource: """ A news source that extracts news items from a Web page using regular expressions. """ def __init__(self, url, titlePattern, bodyPattern): self.url = url self.titlePattern = re.compile(titlePattern) self.bodyPattern = re.compile(bodyPattern) def getItems(self): text = urlopen(self.url).read() titles = self.titlePattern.findall(text) bodies = self.bodyPattern.findall(text) for title, body in zip(titles, bodies): yield NewsItem(title, wrap(body))class PlainDestination: """ A news destination that formats all its news items as plain text. """ def receiveItems(self, items): for item in items: print item.title print '-'*len(item.title) print item.bodyclass HTMLDestination: """ A news destination that formats all its news items as HTML. """ def __init__(self, filename): self.filename = filename def receiveItems(self, items): out = open(self.filename, 'w') print >> out, """ <html> <head> <title>Today's News</title> </head> <body> <h1>Today's News</h1> """ print >> out, '<ul>' id = 0 for item in items: id += 1 print >> out, ' <li><a href="#%i">%s</a></li>' % (id, item.title) print >> out, '</ul>' id = 0 for item in items: id += 1 print >> out, '<h2><a name="%i">%s</a></h2>' % (id, item.title) print >> out, '<pre>%s</pre>' % item.body print >> out, """ </body> </html> """def runDefaultSetup(): """ A default setup of sources and destination. Modify to taste. """ agent = NewsAgent() # A SimpleWebSource that retrieves news from the # BBC news site: bbc_url = 'http://news.bbc.co.uk/text_only.stm' bbc_title = r'(?s)a href="[^"]*">\s*<b>\s*(.*?)\s*</b>' bbc_body = r'(?s)</a>\s*<br />\s*(.*?)\s*<' bbc = SimpleWebSource(bbc_url, bbc_title, bbc_body) agent.addSource(bbc) # An NNTPSource that retrieves news from comp.lang.python.announce: clpa_server = 'news.foo.bar' # Insert real server name clpa_group = 'comp.lang.python.announce' clpa_window = 1 clpa = NNTPSource(clpa_server, clpa_group, clpa_window) agent.addSource(clpa) # Add plain text destination and an HTML destination: agent.addDestination(PlainDestination()) agent.addDestination(HTMLDestination('news.html')) # Distribute the news items: agent.distribute()if __name__ == '__main__': runDefaultSetup()⌨️ 快捷键说明
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