python爬虫学习获取邮箱

     可以写出匹配邮箱的正则表达式为：

r'[0-9a-zA-Z._]+@[0-9a-zA-Z._]+\.[0-9a-zA-Z._]+'
           

     代码如下：

#!/usr/bin/python3
#_*_coding: utf-8_*_
import requests
import re
def get_email(url):
    """get all the email address from the url"""
    content = requests.get(url).text
    pattern = r'[0-9a-zA-Z._]+@[0-9a-zA-Z._]+\.[0-9a-zA-Z._]+'
    p = re.compile(pattern)
    m = p.findall(content)
    with open('emil.txt', 'w') as f:
        for mm in m:
            f.write(mm+'\n')
    '''
    with open('tmp.html', 'w') as f:
        f.writelines(content)
    '''
if __name__=='__main__':
    get_email('https://www.douban.com/note/553260472/?cid=44910100')