【python学习.Github上的代码】

import re, urllib, urllib2

class Xiami(object):

def __init__(self, url_song):
self.url_song = url_song
self.url_xml = self.get_xml()
self.info = self. get_info()
self.loc = self.info[0]
self.lyc = self.info[1]
self.pic = self.info[2]

def get_xml(self):
return 'http://www.xiami.com/song/playlist/id/%s/object_name/default/object_id/0' % re.search('\d+', self.url_song).group()

def get_info(self):
headers = {
'User-Agent':'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6'
}
req = urllib2.Request(
url = self.url_xml,
headers = headers
)
try:
xml = urllib2.urlopen(req).read()
except Exception, e:
raise u'网络错误！，请重试！'
location = re.search(r'(<location>)(.+)(<\/location>)', xml).group(2)
lyc = re.search(r'(<lyric>)(.+)(<\/lyric>)', xml).group(2)
pic = re.search(r'(<pic>)(.+)(<\/pic>)', xml).group(2)
return (location, lyc, pic)

def get_url(self):
strlen = len(self.loc[1:])
rows = int(self.loc[0])
cols = strlen / rows
right_rows = strlen % rows
new_str = self.loc[1:]
real_url = ''

for i in xrange(strlen):
x = i % rows
y = i / rows
p = 0
if x <= right_rows:
p = x * (cols + 1) + y
else:
p = right_rows * (cols + 1) + (x - right_rows) * cols + y
real_url += new_str[p]
return urllib2.unquote(real_url).replace('^', '0')

if __name__ == '__main__':

url = raw_input('please enter the url of the song: ')
xi = Xiami(url)
url_download = xi.get_url()
url_pic = xi.pic
url_lyc = xi.lyc

print u'下载地址是: %s' % url_download

print u"下载开始..."

try:
urllib.urlretrieve(url_download, r'new.mp3')
urllib.urlretrieve(url_pic, r'new.jpg')
urllib.urlretrieve(url_lyc, r'new.lyc')
except:
raise(u'请求错误，请重试')

print u"完成下载..."

1.这些代码都很简单易读懂，必要地方还有注释，方便别人阅读，也方便自己找错误

2.充分利用类的设计，我们现在的小程序都很小所以没有什么必要用类，但这种面向对象的精神应该保留下来，方便以后适应大型程序的开发

3.变量名已看就懂。我的嗲吗有时候变量名图个省事就用a,b,c代替，这样有时会适得其反