使用Python爬虫爬取简单网页（Python爬虫入门）

今天咱们来看一看使用Python爬取一些简单的网页。

所用工具：IDLE (Python 3.6 64-bit)

一. 爬取京东商品页面

我将要爬取的是这个东京商品页面信息，代码以下：

import requests
url = "https://item.jd.com/6957643.html"
try:
    r = requests.get(url)
    r.raise_for_status()
    r.encoding = r.apparent_encoding
    print(r.text[:1000])
except:
        print("爬取失败")

二. 爬取亚马逊商品页面

我接下来要爬取这个亚马逊商品的页面，代码以下：

import requests
url = "https://www.amazon.cn/gp/product/B00W2T39C8/ref=cn_ags_s9_asin?pf_rd_p=33e63d50-addd-4d44-a917-c9479c457e1a&pf_rd_s=merchandised-search-3&pf_rd_t=101&pf_rd_i=1403206071&pf_rd_m=A1AJ19PSB66TGU&pf_rd_r=FQQGZ7T42BF03V117HRD&pf_rd_r=FQQGZ7T42BF03V117HRD&pf_rd_p=33e63d50-addd-4d44-a917-c9479c457e1a&ref=cn_ags_s9_asin_1403206071_merchandised-search-3"
try:
    kv = {'user-agent':'Mozilla/5.0'}
    r = requests.get(url,headers = kv)
    r.raise_for_status()
    r.encoding = r.apparent_encoding
    print(r.text[1000:2000])
except:
    print("爬取失败")

三.  输入关键字爬取百度或360所能搜索到多少数据。代码以下：

import requests
keyword = "Python"
try:
    kv = {'wd':keyword}#若是用360就将键值对wd改为q将baidu改为so
    r = requests.get("http://www.baidu.com/s",params = kv)
    print(r.request.url)
    r.raise_for_status()
    print(len(r.text))
except:
    print("爬取失败")

四. 爬取图片并存入指定地点（E://hh名字abc.jpg）。代码以下：

import requests
import os
url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1533128040259&di=601acd33bcb188bfeb41cb50bc51ed41&imgtype=0&src=http%3A%2F%2Fs1.sinaimg.cn%2Fmw690%2F006LDoUHzy7auXElZGE40%26690"
path = "E://hh/abc.jpg"
try:
    
        r = requests.get(url)
        with open(path,'wb') as f:
            f.write(r.content)
            f.close()
            print("文件已保存")
       
except :
    print("爬取失败")

五.批量爬取图片

import requests
from bs4 import BeautifulSoup
import urllib.request


x = 0
def GetImg():
    response = requests.get('http://www.mzitu.com/zipai/comment-page-2')
    re = response.text
    #建立对象，解析网页
    soup = BeautifulSoup(re,'html.parser')
    #找到img标签
    girl = soup.find_all('img')
    for i in girl:
        global x
        imgl=i.get('src')
        urllib.request.urlretrieve(imgl,'E:/python/xiuxiu/%s.jpg'%x)
        x+=1
        print("正在下载第%x张图片"%x)
        
def getHtml(url):
    headers={'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0'}
    page1=urllib.request.Request(url,headers=headers)
    page=urllib.request.urlopen(page1)

    html=page.read()
    
GetImg()

感受怎么样？学会了吗？