【Python爬虫】Requests库网络爬虫实战

迷南。 2023-02-23 07:57 27阅读 0赞

1.京东商品页面爬取

打开某一个京东页面

[https://item.jd.com/69336974189.html][https_item.jd.com_69336974189.html]

![format_png][]

代码：

import requests
    url="https://item.jd.com/69336974189.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！")

2.亚马逊商品页面的爬取

打开一个亚马逊链接

>>> import requests
    >>> r = requests.get("https://www.amazon.cn/gp/product/B01M8L5Z3Y")
    >>> r.status_code
    200
    >>> r.encoding
    'UTF-8'
    >>> r.encoding = r.apparent_encoding
    >>> r.text
    
    >>> r.request.headers
    {
        'User-Agent': 'python-requests/2.22.0', 'Accept-Encoding': 'gzip, deflate', 'Accept': '*/*', 'Connection': 'keep-alive'}
    >>> kv ={
        'user-agent':'Mozilla/5.0'}
    >>> url = "https://www.amazon.cn/gp/product/B01M8L5Z3Y"
    >>> r = requests.get(url,headers = {
        'user-agent':'Mozilla/5.0'}) #此处将浏览器端口改为'user-agent':'Mozilla/5.0'
    >>> r,status_code
    Traceback (most recent call last):
      File "<pyshell#22>", line 1, in <module>
        r,status_code
    NameError: name 'status_code' is not defined #此处代码报错，一定要注意代码的规范书写，快找找错误在哪里
    >>> r.status_code
    200
    >>> r.request.headers
    {
        'user-agent': 'Mozilla/5.0', 'Accept-Encoding': 'gzip, deflate', 'Accept': '*/*', 'Connection': 'keep-alive'}
    >>> r.text[:1000]
    '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n \n\n\n    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n    <!doctype html><html class="a-no-js" data-19ax5a9jf="dingo">\n    <head>\n<script type="text/javascript">var ue_t0=ue_t0||+new Date();</script>\n<script type="text/javascript">\nwindow.ue_ihb = (window.ue_ihb || window.ueinit || 0) + 1;\nif (window.ue_ihb === 1) {\nvar ue_hob=+new Date();\nvar ue_id=\'E06HEJQW1W99HDZ0Z5H0\',\nue_csm = window,\nue_err_chan = \'jserr-rw\',\nue = {};\n(function(d){var e=d.ue=d.ue||{},f=Date.now||function(){return+new Date};e.d=function(b){return f()-(b?0:d.ue_t0)};e.stub=function(b,a){if(!b[a]){var c=[];b[a]=function(){c.push([c.slice.call(arguments),e.d(),d.ue_id])};b[a].replay=function(b){for(var a;a=c.shift();)b(a[0],a[1],a[2])};b[a].isStub=1}};e.exec=function(b,a){return function(){try{return b.apply(this,arguments)}catch(c){ueLogError(c,{attribution:a||"undefined",logLevel:"WARN"})}}}})(ue_csm);\n\nue.stub(ue,"log");ue.stub(ue,"onunload");ue.stu'
    >>>

全部代码：

import requests
    url = "https://www.amazon.cn/gp/product/B01M8L5Z3Y"
    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")

3，百度/360搜索关键词提交

![format_png 1][]

![format_png 2][]

搜索引擎关键词提交接口  
百度的关键词接口：  
http://www.baidu.com/s?wd=keyword

![format_png 3][]

![format_png 4][]

>>> import requests
    >>> kv = {
        'wd':'Python'}
    >>> r = requests.get("http://www.baidu.com/s",params=kv)
    >>> r.status_code
    200
    >>> r.request.url
    'http://www.baidu.com/s?wd=Python'
    >>> len(r.text)
    524221

代码：

import requests
    keyword = "Python"
    try:
        kv = {
        'wd':keyword}
        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")

360的关键词接口：  
http://www.so.com/s?q=keyword

代码：

import requests
    keyword = "Python"
    try:
        kv ={
        'q':keyword}
        r = requests.get("http://www.so.com/s",params=kv)
        print(r.request.url)
        r.raise_for_status()
        print(r.text)
    except:
        print("爬取失败")

4.网络图片的爬取和存储

网络图片链接的格式：  
http://www.example.com/picture.jpg

比如：

[http://image.nationalgeographic.com.cn/2017/0211/20170211061910157.jpg][http_image.nationalgeographic.com.cn_2017_0211_20170211061910157.jpg]

import requests
    import os
    url = "http://image.nationalgeographic.com.cn/2017/0211/20170211061910157.jpg"
    root = "D://MyProject//Python学习//爬虫学习//"
    path = root + url.split('/')[-1]
    try:
        if not os.path.exists(root):#判断路径是否存在
            os.mkdir(root)
        if not os.path.exists(path):#判断是否有这个文件
            r = requests.get(url)
            with open(path,'wb') as f:
                f.write(r.content)
                f.close()
                print("文件保存成功")
        else:
            print("文件已存在")
    except:
        print("爬取失败")

5.IP地址归属地的自动查询

import requests
    url = "http://ip.ws.126.net/ipquery?ip="
    try:
        r = requests.get(url+'202.204.80.112')
        r.raise_for_status()
        r.encoding = r.apparent_encoding
        print(r.text[-500:])
    except:
        print("爬取失败 ")

![format_png 5][]

[https_item.jd.com_69336974189.html]: https://item.jd.com/69336974189.html
[format_png]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly9pbWcyMDIwLmNuYmxvZ3MuY29tL2Jsb2cvMTc4MzAzMC8yMDIwMDcvMTc4MzAzMC0yMDIwMDcwNTExMTUzMzczNi0xNDg1NTc1MjY0LnBuZw?x-oss-process=image/format,png
[format_png 1]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly9pbWcyMDIwLmNuYmxvZ3MuY29tL2Jsb2cvMTc4MzAzMC8yMDIwMDcvMTc4MzAzMC0yMDIwMDcwNTExNTczMjU1MC02NTI4NjYzNzgucG5n?x-oss-process=image/format,png
[format_png 2]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly9pbWcyMDIwLmNuYmxvZ3MuY29tL2Jsb2cvMTc4MzAzMC8yMDIwMDcvMTc4MzAzMC0yMDIwMDcwNTExNTczOTU0Ny01Njc1NTU5MDMucG5n?x-oss-process=image/format,png
[format_png 3]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly9pbWcyMDIwLmNuYmxvZ3MuY29tL2Jsb2cvMTc4MzAzMC8yMDIwMDcvMTc4MzAzMC0yMDIwMDcwNTExNTgwNzA3Ni0zOTAxMjYxMi5wbmc?x-oss-process=image/format,png
[format_png 4]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly9pbWcyMDIwLmNuYmxvZ3MuY29tL2Jsb2cvMTc4MzAzMC8yMDIwMDcvMTc4MzAzMC0yMDIwMDcwNTExNTgxMDkyNy0xMDE3NDI3MTcucG5n?x-oss-process=image/format,png
[http_image.nationalgeographic.com.cn_2017_0211_20170211061910157.jpg]: http://image.nationalgeographic.com.cn/2017/0211/20170211061910157.jpg
[format_png 5]: http://imgconvert.csdnimg.cn/aHR0cHM6Ly9pbWcyMDIwLmNuYmxvZ3MuY29tL2Jsb2cvMTc4MzAzMC8yMDIwMDcvMTc4MzAzMC0yMDIwMDcwNTEyMzg0OTk4OC0xNjk5OTU5Mzg1LnBuZw?x-oss-process=image/format,png