homework05

eg1:
	import json
	import requests
	import multiprocessing
	
	def text(path):
	    song_play_url_list = []
	    song_name_list = []
	    with open(path,mode='r') as f:
	        res = f.readlines()[0].strip('\n').split('}')
	        for json_ in res[:-1]:
	            _json = json_ + '}'
	            _json = json.loads(_json)
	            song_play_url = _json['song_play_url']
	            if song_play_url is not None:
	                song_play_url_list.append(song_play_url)
	                song_name = _json['song_name']  
	                song_name_list.append(song_name)
	        return song_play_url_list , song_name_list 
	
	song_url,song_name = text('C:/Users/DELL/Desktop/python作业/homework5/top_500.txt')
	
	def download(song_url,song_name):
	    i = -1
	    for path_ in song_url:
	        i += 1
	        response = requests.get(path_)
	        mp3_ = response.content
	        with open('D:/music/'+song_name[i]+'.mp3',mode='wb') as f:
	            f.write(mp3_)
	
	#download(song_url,song_name)
	if __name__ == "__main__":
	    x = int(len(song_url)/2)
	    #创建进程
	    p1 = multiprocessing.Process(target=download,args=(song_url[0:x],song_name[0:x]))
	    p2 = multiprocessing.Process(target=download,args=(song_url[x:],song_name[x:]))
	    #启动进程
	    p1.start()
	    p2.start()
	    p1.join()
	    p2.join()
	    print("Over")

	import multiprocessing
	from lxml import etree
	import requests
	import re
	def novel():
	    response = requests.get('https://www.17k.com/list/3015690.html')   #请求网页 
	    response.encoding = 'utf8'
	    tree = etree.HTML(response.text)    #调用HTML类进行初始化，这样就成功构造了一个XPath解析对象
	    w_list = tree.xpath('//html/body/div[@class="Main List"]/dl[@class="Volume"]/dd/a')   #提取每一个a标签的内容
	    #= []
	    for i in w_list:
	        href = i.xpath('./@href')[0]    #提取href标签的内容
	        a  = 'http://www.17k.com/'
	        html = a + href
	        url.append(html)
	    return url
	html_list = novel()
	def write_(html_list):
	    b = 0
	    for html in html_list:
	        res = requests.get(html)
	        res.encoding = 'utf8'
	        tree1 = etree.HTML(res.text)
	        b_list = tree1.xpath('//html/body/div[@class="area"]/div[2]/div[2]/div[1]/div[2]/p/text()')  
	        txt = str(b_list)
	        b += 1
	        with open('D:/novel/'+str(b)+'.txt',mode='w') as f:
	            f.write(txt) 
	
	if __name__ == "__main__":
	    x = int(len(html_list)/2)
	    p1 = multiprocessing.Process(target=write_,args=(html_list[0:x],))
	    p2 = multiprocessing.Process(target=write_,args=(html_list[x:],))
	    p1.start()
	    p2.start()
	    p1.join()
	    p2.join()
	    print("Over")