Python之爬蟲-貓眼電影
#!/usr/bin/env python
# coding: utf-8
import json
import requests
import re
import time
# 貓眼多了反爬蟲,速度過快,則會無響應,因此這裏多了一個延時等待
from requests.exceptions import RequestException
def get_one_page(url):
try:
headers = {
'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36(KHTML, like Gecko) '
'Chrome/52.0.2743.116 Safari/537.36',
}
response = requests.get(url, headers=headers)
if response.status_code == 200:
return response.text # 使得get_one_page()函數輸出是一個文本
return None
except RequestException:
return None
def parse_one_page(html):
pattern = re.compile(
'<dd>.*?board-index.*?>(.*?)</i>.*?name.*?a.*?>(.*?)</a>.*?star.*?>(.*?)</p>.*?releasetime.*?>(.*?)</p>.*?'
'integer.*?>(.*?)</i>.*?fraction.*?>(.*?)</i>.*?</dd>',
re.S) # 正則表達式獲取須要保存的東西編譯成正則表達式對象
items = re.findall(pattern, html) # 遍歷html文件中的全部pattern正則表達式對象
for item in items: # 把提取的對象裝入字典中
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): # 把文件寫入並保存在result.tx + '\n')
with open('result.txt', 'a', encoding='utf-8') as f:
f.write(json.dumps(content, ensure_ascii=False) + '\n')
def main(offset): # 遍歷TOP100的電影的全部網址
url = 'http://maoyan.com/board/4?offset=' + str(offset) # 接收一個偏移量offset
html = get_one_page(url)
for item in parse_one_page(html):
print(item)
write_to_file(item)
if __name__ == '__main__': # 建立一個偏移量offset
for i in range(10):
main(offset=i * 10)
time.sleep(1)