Dieses Mal bringe ich Ihnen Python mit, um ein Nachrichtenaggregationsprojekt zu erstellen. Was sind die Vorsichtsmaßnahmen für Python, um ein Nachrichtenaggregationsprojekt zu erstellen?
Beginnen wir mit dem Code und analysieren wir ihn dann einzeln:
from nntplib import NNTP
from time import strftime,time,localtime
from email import message_from_string
from urllib import urlopen
import textwrap
import re
day = 24*60*60
def wrap(string,max=70):
'''
'''
return '\n'.join(textwrap.wrap(string)) + '\n'
class NewsAgent:
'''
'''
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):
items = []
for source in self.sources:
items.extend(source.getItems())
for dest in self.destinations:
dest.receiveItems(items)
class NewsItem:
def init(self,title,body):
self.title = title
self.body = body
class NNTPSource:
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:
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:
def receiveItems(self,items):
for item in items:
print item.title
print '-'*len(item.title)
print item.body
class HTMLDestination:
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</hi>
'''
print >> out, '<ul>'
id = 0
for item in items:
id += 1
print >> out, '<li><a href="#" rel="external nofollow" >%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 class="brush:php;toolbar:false">%s' % item.body
print >> out, '''