10_urllib_ajax的get请求豆瓣电影前10页.py

# 难点：找接口
# https://movie.douban.com/j/chart/top_list?type=24&interval_id=100%3A90&action=&
# start=0&limit=20
# https://movie.douban.com/j/chart/top_list?type=24&interval_id=100%3A90&action=&
# start=20&limit=20
# https://movie.douban.com/j/chart/top_list?type=24&interval_id=100%3A90&action=&
# start=40&limit=20
# https://movie.douban.com/j/chart/top_list?type=24&interval_id=100%3A90&action=&
# start=60&limit=20

# page    1     2     3     4
# start   0     20    40    60

#start (page-1)*20

# 下载豆瓣电影前十页的数据
# （1）请求对象的定制
# （2）获取响应的数据
# （3）下载数据
import urllib.parse
import urllib.request


def create_request(page):
    # url1 = 'https://movie.douban.com/j/chart/top_list?type=24&interval_id=100%3A90&action=&start='
    # page = str(page)
    # url2 = '&limit=20'
    # url = url1+page+url2
    base_url = 'https://movie.douban.com/j/chart/top_list?type=24&interval_id=100%3A90&action=&'

    data = {
        'start': (page-1)*20,
        'limit': 20
    }

    data = urllib.parse.urlencode(data)
    url = base_url+data
    # print(url)
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36'
    }

    request = urllib.request.Request(url=url, headers=headers)

    return request


def get_content(request):
    response = urllib.request.urlopen(request)
    content = response.read().decode('utf_8')
    return content


def down_load(page, content):
    with open('douban'+str(page)+'.json', 'w', encoding='utf-8') as fp:
        fp.write(content)


# 程序入口
if __name__ == '__main__':
    start_page = int(input('请输入起始页码：'))
    end_page = int(input('请输入终止页码：'))

    for page in range(start_page, end_page+1):
        # print(page)
        # 要求每一页都有自己请求对象的定制
        request = create_request(page)
        # （2）获取响应的数据
        content = get_content(request)
        # （3）下载数据
        down_load(page, content)