python3 requests模块

# coding:gbk
import requests

response = requests.get('http://www.sina.com.cn/')
print(response)
print(response.status_code)  # 200正常，404找不到网页，503等5开头的是人家网站内部错误
print(response.content)

补充：这个模块需要安装下，可以在pycharm中的Terminal里执行：pip install requests，然后File/Settings/Project Interpreter/ 添加模块

爬虫实例

import re
import requests
from multiprocessing import Pool

def get_page(url, pattern):
    response = requests.get(url)
    if response.status_code == 200:
        return (response.text, pattern)

def parse_page(info):
    page_content, pattern = info
    res = re.findall(pattern, page_content)
    for item in res:
        dic = {
            'index': item[0],
            'title': item[1],
            'actor': item[2].strip()[3:],
            'time': item[3][5:],
            'score': item[4]+item[5]

        }
        print(dic)
if __name__ == '__main__':
    pattern1 = re.compile(r'<dd>.*?board-index.*?>(d+)<.*?title="(.*?)".*?star.*?>(.*?)<.*?releasetime.*?>(.*?)'
                        r'<.*?integer.*?>(.*?)<.*?fraction.*?>(.*?)<', re.S)

    url_dic = {
        'http://maoyan.com/board/7': pattern1,
    }

    p = Pool()
    for url, pattern in url_dic.items():
        res = p.apply_async(get_page, args=(url, pattern), callback=parse_page)

    p.close()
    p.join()


# {'index': '1', 'time': '2019-05-16', 'title': '海蒂和爷爷', 'actor': '阿努克·斯特芬,布鲁诺·甘茨,昆林·艾格匹', 'score': '9.5'}
# {'index': '2', 'time': '2019-05-31', 'title': '尺八·一声一世', 'actor': '佐藤康夫,小凑昭尚,蔡鸿文', 'score': '9.4'}
# {'index': '3', 'time': '2019-06-05', 'title': '无所不能', 'actor': '赫里尼克·罗斯汉,亚米·高塔姆,洛尼特·罗伊', 'score': '9.3'}
# {'index': '4', 'time': '2019-04-29', 'title': '何以为家', 'actor': '赞恩·阿尔·拉菲亚,约丹诺斯·希费罗,博鲁瓦蒂夫·特雷杰·班科尔', 'score': '9.3'}
# {'index': '5', 'time': '2019-05-17', 'title': '一条狗的使命2', 'actor': '丹尼斯·奎德,凯瑟琳·普雷斯科特,刘宪华', 'score': '9.2'}
# {'index': '6', 'time': '2019-05-10', 'title': '一个母亲的复仇', 'actor': '希里黛玉,阿克夏耶·坎纳,萨佳·阿里', 'score': '9.2'}
# {'index': '7', 'time': '2019-05-24', 'title': '龙珠超：布罗利', 'actor': '野泽雅子,堀川亮,中尾隆圣', 'score': '9.2'}
# {'index': '8', 'time': '2019-05-01', 'title': '港珠澳大桥', 'actor': '2288;', 'score': '9.2'}
# {'index': '9', 'time': '2019-05-17', 'title': '音乐家', 'actor': '胡军,袁泉,别里克·艾特占诺夫', 'score': '9.1'}
# {'index': '10', 'time': '2019-05-24', 'title': '阿拉丁', 'actor': '梅纳·玛索德,娜奥米·斯科特,马尔万·肯扎里', 'score': '9.0'}