Thinking more…

上星期看到這篇：如何将Bing的每日桌面图像变成我的Windows 7桌面，就順手試試看改用 Python 來作，執行這個 script 以後，會自動拿 bing 的圖片來作為你 GNOME 的桌面背景圖片。
目前只有一個小問題，就是 xml.dom.minidom 有時候會因為 & 的關係導致解析失敗。

#!/usr/bin/env python
import random
import os.path
import subprocess
import urllib2
import xml.dom.minidom
from xml.dom.minidom import Node
def get_xml():
response = urllib2.urlopen('http://feeds.feedburner.com/bingimages')
xml = response.read()
return xml
def parse_and_get_first_image_uri( xml_str ):
if xml_str=="":
return ""
doc=xml.dom.minidom.parseString( xml_str )
urls=[]
for node in doc.getElementsByTagName("enclosure"):
urls.append( node.getAttribute("url") )
index=random.randint( 0, len(urls)-1 )
if len(urls)>0:
return urls[ index ]
else:
return ""
def get_uri( uri, output ):
response = urllib2.urlopen( uri )
image_file=open( output, 'w' )
image_file.write( response.read() )
image_file.close()
return
def set_wallpaper( filename ):
args=[]
args.append( 'gconftool-2' )
args.append( '/desktop/gnome/background/picture_filename' )
args.append( '--set' )
args.append( filename )
args.append( '--type=string' )
subprocess.call( args )
uri=parse_and_get_first_image_uri( get_xml() )
tmp_dir = os.path.join( *(os.path.expanduser("~"), "tmp") )
if uri!="":
if not os.path.exists( tmp_dir ):
os.mkdir( tmp_dir )
filename, extname = os.path.splitext( os.path.basename( uri ) )
image_filename=os.path.join( *( tmp_dir, "bing" + extname ) )
get_uri( uri, image_filename )
set_wallpaper( image_filename )
else:
print "get nothing."

buildbot 是用 twisted library 裡的 sendmail 寄信的，方法如下：

from email.Message import Message
from twisted.mail.smtp import sendmail
from twisted.internet import defer
from twisted.internet import reactor
m = Message()
m.set_payload("Hello world!!")
m['To']="someone@somewhere.com"
m['Subject'] = "Test"
m['From'] = "my@somewhere.com"
s = m.as_string()
done = sendmail( "mailserver", "my@somewhere.com", [ "someone@somewhere.com" ], s)
done.addCallback(lambda ignored: reactor.stop())
reactor.run()

但現在大多的 mail server 都需要先認證，這時候就得改用 ESMTPSenderFactory 來改寫了(可參考Twisted mail smtp API)，mailing list 裡正好有人貼出程式：

from twisted.mail import smtp
from twisted.internet import reactor
from twisted.internet import defer
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
def sendmail_auth(smtphost, user, password,
from_addr, to_addrs, msg, senderDomainName=None, port=25):
if not hasattr(msg,'read'):
msg = StringIO(str(msg))
d = defer.Deferred()
factory = smtp.ESMTPSenderFactory(user, password, from_addr, to_addrs, msg, d,
requireTransportSecurity=False)
if senderDomainName is not None:
factory.domain = senderDomainName
reactor.connectTCP(smtphost, port, factory)
return d

再套前面的例子，只要改動 sendmail 為 sendmail_auth 就行了：程式：

done = sendmail_auth( "mailserver", "your_username", "your_password", "my@somewhere.com", [ "someone@somewhere.com" ], s)