[快学Python3]HTTP处理 - urllib模块

# -*- coding:utf-8 -*-

__author__ = '苦叶子'

import urllib.request
import csv
import codecs

if __name__ == "__main__":
    print("urllib爬取豆瓣网数据示例")
    print("搜索下关键字： Python")

    url = "https://api.douban.com/v2/book/search?q=python"
    response = urllib.request.urlopen(url)

    # 将bytes数据流解码成string
    ebook_str = response.read().decode()

    # 将string转换成dict
    ebook_dict = eval(ebook_str)

    #print(ebook_dict)
    #print(type(ebook_dict))
    count = ebook_dict["count"]    
    total = ebook_dict["total"]

    with codecs.open('books.csv', 'w', 'utf-8') as csvfile:
        spamwriter = csv.writer(csvfile, delimiter=',',
                                quotechar='|', quoting=csv.QUOTE_MINIMAL)
        spamwriter.writerow(["书名", "作者", "描述", "出版社", "价格"])
        # 写书信息        
        for book in ebook_dict["books"]:
            spamwriter.writerow([book["title"], 
                ",".join(book["author"]), 
                book["summary"], 
                book["publisher"], 
                book["price"]])
            


        # 从第2页开始，获取其他书籍信息        
        # 这段代码采集了大量数据，容易被封IP，所以注释了
        """
        for start in range(1, int(total / count) + 1):
            url = "https://api.douban.com/v2/book/search?q=python&start=%d" % start
            try:
                response = urllib.request.urlopen(url)
            except:                
                print("别老爬别人的数据，要爬也别太快，会被封IP的")  
                break


            # 将bytes数据流解码成string
            ebook_str = response.read().decode()

            # 将string转换成dict
            ebook_dict = eval(ebook_str)

            # 输出书籍信息
            for book in ebook_dict["books"]:
                spamwriter.writerow([book["title"], 
                ",".join(book["author"]), 
                book["summary"], 
                book["publisher"], 
                book["price"]]) 
        """    
        print("总计搜索了 %d 本书的信息" % total)

# -*- coding:utf-8 -*-

__author__ = '苦叶子'

import urllib.request

if __name__ == "__main__":    
    print("urllib基本实例")

    url = "http://www.baidu.com"

    # 访问下百度
    response = urllib.request.urlopen(url)    

    # 打印下状态码
    print(response.status)    
    
    # 打印下状态码对应的可读性文字说明，例如在http协议里，200 对应 OK
    print(response.reason)    
    
    # 打印下请求返回的header
    print(response.headers)    
    
    # 打印下请求返回的数据
    print(response.read().decode("utf-8"))