文章目录

Day03笔记

requests模块

常用方法
代理：proxies
Web客户端验证：auth
SSL证书认证 : verify

Handler处理器(urllib.request)

定义
常用方法
使用流程
Handler处理器分类

Day03笔记

requests模块

常用方法

get() : 发起请求,获取响应对象response
1. response对象
  1. response.text: 字符串
    字符编码：ISO-8859-1
    response.encoding = "utf-8"
    2.response.content: bytes
  2. response.status_code : 返回响应码
2. 没有查询参数
  res = requests.get(url,headers=headers)
3. 有查询参数
  params={“wd”:“美女”}
  res = requests.get(url,params=params,headers=headers)
4. for example:
```
import requests

url = "http://www.baidu.com/s?"
headers = {"User-Agent":"Mozilla5.0/"}
s = input("请输入要搜索的内容:")
# get方法params参数必须要为 字典 格式,自动编码
wd = {"wd":s}
res = requests.get(url,params=wd,headers=headers)
res.encoding = "utf-8"
print(res.text)
```

post() : 参数名data

data={} #data参数为字典,不用转为 bytes 数据类型

for example：

import requests
import json

# 处理表单数据
# Form表单的数据要放到字典中,然后再进行编码转换
word = input("请输入要翻译的内容:")
data = {"i":word,
        "from":"AUTO",
        "to":"AUTO",
        "smartresult":"dict",
        "client":"fanyideskweb",
        "salt":"1536648321283",
        "sign":"1e7948e25551448dbfb7184f23dc126c",
        "doctype":"json",
        "version":"2.1",
        "keyfrom":"fanyi.web",
        "action":"FY_BY_REALTIME",
        "typoResult":"false"
    }

url = "http://fanyi.youdao.com/translate?smartresult=dict&smartresult=rule"
headers = {"User-Agent":"Mozilla5.0/"}
res = requests.post(url,data=data,headers=headers)
res.encoding = "utf-8"
result = res.text

# 把json格式的字符串转换为 Python字典
# json模块中的loads方法 ：json格式字符串 -> Python字典
result_dict = json.loads(result)
r = result_dict["translateResult"][0][0]["tgt"]
print(r)

代理：proxies

爬虫和反爬虫斗争的第二步
获取代理IP的网站
西刺代理
快代理
全网代理

普通代理：proxies={“协议”:“IP地址:端口号”}

proxies={"HTTP":"222.221.11.119:3128"}

for example:

import requests

url = "http://www.taobao.com/"
proxies = {"HTTP":"222.221.11.119:3128"}
headers = {"User-Agent":"Mozilla5.0/"}

res = requests.get(url,proxies=proxies,headers=headers)
res.encoding = "utf-8"
print(res.text)

私密代理：

proxies={"HTTP":"http://309435365:[email protected]:16819"}

for example :

import requests

url = "http://www.taobao.com/"
headers = {"User-Agent":"Mozilla5.0/"}
proxies={"HTTP":"http://309435365:[email protected]:16819"}

#114.67.228.126:16819
res = requests.get(url,proxies=proxies,headers=headers)
res.encoding = "utf-8"
print(res.status_code)

爬取链家MongoDb

import requests
import re
import pymongo

class LianJiaSpider:
    def __init__(self):
        self.baseurl = "https://bj.lianjia.com/ershoufang/pg"
        self.headers = {"User-Agent":"Mozilla5.0/"}
        self.proxies = {"HTTP":"http://309435365:[email protected]:16819"}
        self.page = 1
        # 创建连接对象
        self.conn = pymongo.MongoClient("localhost",27017)
        # 创建数据库对象
        self.db = self.conn.Lianjia#库名
        #　创建集合对象
        self.myset = self.db.housePrice#表名

    # 获取页面
    def getPage(self,url):
        res = requests.get(url,proxies=self.proxies,headers=self.headers)
        res.encoding = "utf-8"
        html = res.text
        self.parsePage(html)
    
    # 用正则解析页面
    def parsePage(self,html):
        p = re.compile('<div class="houseInfo">.*?data-el="region">(.*?)</a>.*?<div class="totalPrice">.*?<span>(.*?)</span>',re.S)
        r_list = p.findall(html)
        # [("首科花园","595"),(),()]
        self.writeToMogo(r_list)
        
    # 保存本地文件
    def writeToMogo(self,r_list):
        for r_tuple in r_list:
            d = {"houseName":r_tuple[0].strip(),
                 "housePrice":float(r_tuple[1].strip())*10000}
            self.myset.insert(d)
        print("存入mongodb数据库成功")
        # mongo
        # show dbs;
        # use Lianjia;
        # show tables;
        # db.housePrice.find().pretty();



    # 主函数
    def workOn(self):
        while True:
            print("正在爬取%d页" % self.page)
            # 拼接URL
            url = self.baseurl + str(self.page) + "/"
            self.getPage(url)
            print("第%d页爬取成功" % self.page)
            
            c = input("是否继续爬取(y/n):")
            if c.strip().lower() == "y":
                self.page += 1
            else:
                print("爬取结束,谢谢使用!")
                break
            
if __name__ == "__main__":
    spider = LianJiaSpider()
    spider.workOn()

爬取链家MySql

import requests
import re
import pymysql
import warnings

class LianJiaSpider:
    def __init__(self):
        self.baseurl = "https://bj.lianjia.com/ershoufang/pg"
        self.headers = {"User-Agent":"Mozilla5.0/"}
        self.proxies = {"HTTP":"http://309435365:[email protected]:16819"}
        self.page = 1
        # 创建数据库连接对象
        self.db = pymysql.connect("localhost","root",
                          "123456",charset="utf8")
        # 创建游标对象
        self.cursor = self.db.cursor()
    
    # 获取页面
    def getPage(self,url):
        res = requests.get(url,proxies=self.proxies,headers=self.headers)
        res.encoding = "utf-8"
        html = res.text
        print("页面已获取,正在解析页面...")
        self.parsePage(html)
    
    # 用正则解析页面
    def parsePage(self,html):
        p = re.compile('<div class="houseInfo">.*?data-el="region">(.*?)</a>.*?<div class="totalPrice">.*?<span>(.*?)</span>',re.S)
        r_list = p.findall(html)
        # [("首科花园","595"),(),()]
        print("正在存入mysql数据库...")
        self.writeToMysql(r_list)
        
    # 保存到MySQL数据库
    def writeToMysql(self,r_list):
        c_db = "create database if not exists spider;"
        u_db = "use spider;"
        c_tab = "create table if not exists lianjia(\
                 id int primary key auto_increment,\
                 name varchar(30),\
                 price decimal(20,2))charset=utf8;"
        # 过滤警告
        warnings.filterwarnings("error")
        try:
            self.cursor.execute(c_db)
        except Warning:
            pass

        self.cursor.execute(u_db)

        try:
            self.cursor.execute(c_tab)
        except Warning:
            pass
        
        # r_list : [("首科花园","595"),(),()]
        for r_tuple in r_list:
            s_insert = "insert into lianjia(name,price) \
                        values('%s','%s');" % \
                        (r_tuple[0].strip(),
                         float(r_tuple[1].strip())*10000)
            self.cursor.execute(s_insert)
            self.db.commit()
        print("第%d页存入数据库成功" % self.page)

    # 主函数
    def workOn(self):
        while True:
            print("正在爬取%d页" % self.page)
            # 拼接URL
            url = self.baseurl + str(self.page) + "/"
            self.getPage(url)
            print("第%d页爬取成功" % self.page)
            
            c = input("是否继续爬取(y/n):")
            if c.strip().lower() == "y":
                self.page += 1
            else:
                print("爬取结束,谢谢使用!")
                break
            
if __name__ == "__main__":
    spider = LianJiaSpider()
    spider.workOn()

链家信息保存到本地

import requests
import re

class LianJiaSpider:
    def __init__(self):
        self.baseurl = "https://bj.lianjia.com/ershoufang/pg"
        self.headers = {"User-Agent":"Mozilla5.0/"}
        self.proxies = {"HTTP":"http://309435365:[email protected]:16819"}
        self.page = 1
    
    # 获取页面
    def getPage(self,url):
        res = requests.get(url,proxies=self.proxies,headers=self.headers)
        res.encoding = "utf-8"
        html = res.text
        self.parsePage(html)
    
    # 用正则解析页面
    def parsePage(self,html):
        p = re.compile('<div class="houseInfo">.*?data-el="region">(.*?)</a>.*?<div class="totalPrice">.*?<span>(.*?)</span>',re.S)
        r_list = p.findall(html)
        # [("首科花园","595"),(),()]
        self.writePage(r_list)
        
    # 保存本地文件
    def writePage(self,r_list):
        for r_tuple in r_list:# r_tuple ("首科花园","595")
            for r_str in r_tuple:
                with open("链家二手房.txt","a") as f:
                    f.write(r_str.strip() + "  ")
            
            with open("链家二手房.txt","a") as f:
                f.write("\n")
    # 主函数
    def workOn(self):
        while True:
            print("正在爬取%d页" % self.page)
            # 拼接URL
            url = self.baseurl + str(self.page) + "/"
            self.getPage(url)
            print("第%d页爬取成功" % self.page)
            
            c = input("是否继续爬取(y/n):")
            if c.strip().lower() == "y":
                self.page += 1
            else:
                print("爬取结束,谢谢使用!")
                break
            
if __name__ == "__main__":
    spider = LianJiaSpider()
    spider.workOn()

Web客户端验证：auth

auth = (“用户名”,“密码”)
auth = ("lht4815","123456789lht")
requests.get(url,auth=auth,headers=headers)

SSL证书认证 : verify

verify=True : 默认,做SSL证书认证
verify=False : 忽略证书认证

for example:

import requests

url = "https://www.12306.cn/mormhweb/"
headers = {"User-Agent":"Mozilla5.0/"}

res = requests.get(url,verify=False,headers=headers)
res.encoding = "utf-8"
print(res.text)

Handler处理器(urllib.request)

定义

自定义的urlopen()方法,urlopen方法是一个特殊的opener

常用方法

build_opener(Handler处理器对象)
opener.open(url)

使用流程

创建相关的Handler处理器对象
http_handler = urllib.request.HTTPHandler()
创建自定义opener对象
opener = urllib.request.build_opener(http_handler)
利用opener对象的open方法发请求

Handler处理器分类

HTTPHandler()

import urllib.request

url = "http://www.baidu.com/"
# 1.创建HTTPHandler处理器对象
http_hander = urllib.request.HTTPHandler()
# 2.创建自定义的opener对象
opener = urllib.request.build_opener(http_hander)
# 3.利用opener对象的open方法发请求
req = urllib.request.Request(url)
res = opener.open(req)
print(res.read().decode("utf-8"))

ProxyHandler(代理IP) : 普通代理

import urllib.request

url = "http://www.baidu.com/"
proxy = {"HTTP":"120.78.196.33:3128"}
# 1.创建Handler
proxy_handler = urllib.request.ProxyHandler(proxy)
# 2.创建自定义opener
opener = urllib.request.build_opener(proxy_handler)
# 3.利用open方法发请求
req = urllib.request.Request(url)
res = opener.open(req)
print(res.read().decode("utf-8"))

ProxyBasicAuthHandler(密码管理器对象) : 私密代理

Python爬虫 Day03

文章目录

Day03笔记

requests模块

常用方法

代理：proxies

Web客户端验证：auth

SSL证书认证 : verify

Handler处理器(urllib.request)

定义

常用方法

使用流程

Handler处理器分类

猜你喜欢

Python爬虫 Day03

文章目录

Day03笔记

requests模块

常用方法

代理 ：proxies

Web客户端验证 ：auth

SSL证书认证 : verify

Handler处理器(urllib.request)

定义

常用方法

使用流程

Handler处理器分类

猜你喜欢

代理：proxies

Web客户端验证：auth