python爬蟲—學習筆記-2
ps:因為本人近一個月住院,文章為隊友所著。
任務
獲取豆瓣網站內容。
單頁獲取
網址:https://movie.douban.com/top250
獲取網頁資訊
程式碼:
import requests
url="https://movie.douban.com/top250"
headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0"}
response=requests.get(url,headers=headers)
print(response.text)
為了方便檢視,獲取的程式碼建立一個html網頁放進其中。
獲取第一頁的電影名字
電影名字包含在
<span class="title">([^ ].*?)</span>
這個標籤之中,所以需要
import requests
import re
url="https://movie.douban.com/top250"
headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0"}
response=requests.get(url,headers=headers)
#獲取電影名字
movieName=re.findall( '<span class="title">([^ ].*?)</span>',response.text)
print(movieName)
#^:意為除了
將電影名字與評分聯絡起來
多頁獲取
構建url
首頁:https://movie.douban.com/top250
第二頁:https://movie.douban.com/top250?start=25&filter=
第三頁:https://movie.douban.com/top250?start=50&filter=
………………
最後一頁:https://movie.douban.com/top250?start=250&filter=
可以看出其中存在一些關係
‘https://movie.douban.com/top250?start=‘+25的倍數+‘&filter= ’
所以url可以這樣構建
url="https://movie.douban.com/top250?start=" + str(i) + "&filter="
import requests
import re
headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.0"}
movieName=[]
score=[]
for i in range(0,250,25):
url="https://movie.douban.com/top250?start=" + str(i) + "&filter="
response=requests.get(url,headers=headers)
movieName+=re.findall('<span class="title">([^ ].*?)</span>',response.text)
score=score+ re.findall('<span class="rating_num" property="v:average">(.*?)</span>',response.text)
print(movieName)
print(score)
l=[]
for i in range(250):
l.append((i+1,movieName[i],score[i]))
print(l)
for i in l:
print(i)
import requests
import re
headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.0"}
movieName=[]
score=[]
for i in range(0,250,25):
url="https://movie.douban.com/top250?start=" + str(i) + "&filter="
response=requests.get(url,headers=headers)
movieName+=re.findall('<span class="title">([^ ].*?)</span>',response.text)
score=score+ re.findall('<span class="rating_num" property="v:average">(.*?)</span>',response.text)
print(movieName)
print(score)
l=[]
for i in range(250):
l.append((i+1,movieName[i],score[i]))
print(l)
for i in l:
print(i)
獲取網頁圖片
首先找到圖片所在的標籤
import requests
import re
url="https://movie.douban.com/top250?start=0&filter="
headers={"User-Agent":'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.0'}
response=requests.get(url,headers=headers)
movieName=re.findall('<span class="title">([^ ].*?)</span>',response.text)
imgurl=re.findall('src="(.*?)" class="">',response.text)
for i in range(25):
imgres=requests.get(imgurl[i],headers=headers)
filename="./images/" + movieName[i] + ".jpg"
with open (filename,mode="wb") as f:
f.write(imgres.content)
注意:
獲取圖片時不應太平頻繁 , 可以的話適當加上一個獲取時間間隔 。