beautifulsoup学习-抓取页面并解析_html/css_WEB-ITnose

以汽车之家为例子，抓取页面并进行解析

# -*- coding=utf-8 -*-import urllib2from BeautifulSoup import BeautifulSoup as bs3import jsonimport codecs#字符检测，用来检测其真实的编码格式import chardet#save content to filedef save_to_file(filename, content):	f = open(filename, 'w+')	assert(f)	f.write(content)	f.close()	def parse_json_data(content):	print(chardet.detect(content[0]))		name_list = ['keyLink', 'config', 'option','color', 'innerColor']	print(json.dumps(content[0].decode('GB2312')))def parse_content(content):	#content是GB2312的编码	soup = bs3(content)		key_text = 'var levelId'	elem_lib = soup.find('script', text=lambda(x):key_text in x)		#str_script是utf-8的编码	str_script = str(elem_lib.string)		#print(chardet.detect(str_script))		#由于命令行是cp936 GBK的编码，如果编码不符合无法打印	strGBK = str_script.decode('utf-8').encode('gb2312')	#print(strGBK)		#移除html的转义字符 	strGBK = strGBK.replace(' ','')		d = strGBK.splitlines()	list_data = []		for i in d:		if i.isspace():			continue				#过滤不需要的变量		if len(i) < 100:			continue				#取出json数据		idx = i.find('{')		if idx == -1:			continue				#移除最后的;		k = i[idx:-1]		list_data.append(k)		parse_json_data(list_data)		'''	print('json.count=', len(list_data))	for i in list_data:		if len(i) > 200:			print(i[0:200])		else:			print(i)		parse_json_data(list_data)	'''		#不能再函数中直接使用exec，但是可以使用eval	'''	strSentece = ''	for i in d:		if i.isspace():			continue				if 'null' in j:			continue				#移除var的类型定义,javascript需要,python不需要		j = i[4:]				strSentece += i		#可以直接在python中执行json的赋值语句，类似dict赋值	exec(strSentece)		#输出变量数据	var_list = ['keyLink', 'config','option','color','innerColor']	for i in var_list:		exec('print %s' % (i,))	'''		def crawler_4_autohome():	autohome_url = 'http://car.autohome.com.cn/config/series/657.html'		#uft-8	content = urllib2.urlopen(url=autohome_url).read()	#print(chardet.detect(content))	parse_content(content)		if __name__ == '__main__':	crawler_4_autohome()