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1.通过爬取网页源代码

import requestsdef getHTMLText(url):    try:        r=requests.get(url,timeout=30)        r.raise_for_status()        r.encoding=r.apparent_encoding        return r.text    except:        return "产生异常"if __name__=="__main__":    url="http://www.sdust.edu.cn"    print(getHTMLText(url))

import requestsurl="https://item.jd.com/5181380.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")

import requestsurl="https://www.amazon.cn/gp/product/B071SDP8PC"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[24440:25145])except:    print("爬取失败")

import requestskeyword="Python"url="https://wwww.baidu.com/s"try:    kv={'wd':keyword}    r=requests.get(url,params=kv)    print(r.request.url)    r.raise_for_status()    print(len(r.text))except:    print("爬取失败")

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

5.网络图片的爬取与下载

import requestsimport osurl="http://image.nationalgeographic.com.cn/2017/0730/20170730125917668.jpg"root="E://Python//wordplace//getHTMLText//picture//"path=root + url.split('/')[-1]try:    if not os.path.exists(root):        os.mkdir(root)    if not os.path.exists(path):        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")

import requestsurl="http://m.ip138.com/ip.asp?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")

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