爬的對象爲貓眼電影排行榜TOP10,Website:http://maoyan.com/board
思路和程序參考了課時14:Request+正則表達式爬取貓眼電影
首先下面是爬取的結果:
貼出代碼:
import json
import requests
from requests.exceptions import RequestException
import re
def get_one_page(url):
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'
}
try:
response = requests.get(url,headers=headers)
if response.status_code == 200:
return response.text
except RequestException:
return None
def parse_one_page(html):
pattern = re.compile('<dd>.*?board-index.*?>(\d+)</i>'
'.*?<p.*?"name"><.*?title="(.*?)"'
'.*?"star">(.*?)</p>'
'.*?"releasetime">(.*?)</p>'
'.*?integer">(.*?)</i>.*?fraction">(.*?)</i>.*?</dd>'
, re.S)
res = re.findall(pattern,html)
for item in res:
yield {
'index': item[0],
'title': item[1],
'actor': item[2].strip()[3:],
'time':item[3].strip()[5:],
'score': item[4] + item[5]
}
def write_to_file(content):
with open('result.txt','a',encoding='utf-8')as f:
f.write(json.dumps(content, ensure_ascii=False) + '\n')
f.close()
def main():
url = 'http://maoyan.com/board'
html=get_one_page(url)
for item in parse_one_page(html):
print(item)
write_to_file(item)
if __name__ == '__main__':
main()
問題及解決方法:
(1)IndentationError: unexpected indent
分析:拼寫錯誤(exceptions,注意s...)及縮進問題(遇到了很多次縮進的問題,去報錯行的上一行回車就能找到正確的縮進間距)。
(2)takes 0 positional arguments but 1 was given
分析:是自定義函數裏面沒有帶參數,原程序爬的排行榜有100個,需要翻頁所以main函數括號裏設置了參數(offset),但我這個程序裏不需要翻頁(現在的貓眼只有TOP10)。
(3)'yield' outside function
分析:yield必須在function裏面使用,不能直接用在function外面,注意是否寫在def下面。
(4)<title>貓眼訪問控制</title>
<h3><span class="icon">⛔️</span>很抱歉,您的訪問被禁止了</h3>
分析:需要僞裝瀏覽器,在headers中添加’User-Agent’字典內容如下:
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'
}
並修改:
response = requests.get(url,headers=headers)
My Prey Is Near.
部分內容參考:https://blog.csdn.net/wenboyu/article/details/78166713
https://blog.csdn.net/u013205877/article/details/70332612