Python web crawler

I've been exposed to reptile knowledge before, but in general it's best to use Python because Python has a lot of libraries for data collection,

In addition, the language of Python is more concise and easy to read, in the process of acquisition, maintenance is more convenient!

Let's start with a few simple data collection:

Import requests

Req=requests.get ("http://www.baidu.com")

Print Req.content

This is equivalent to a simple HTTP GET request!

Import Urllib

Req=urllib.urlopen ("http://www.baidu.com")

Print Req.read ()

This is equivalent to a simple reptile.

Import Requests,json

Url= "Http://www.baidu.com/login"

payload={' username ': ' admin ', ' pwd ': ' mima123 '}

Req=requests.get (Url,data=json.dumps (payload))

Print Req.content

This is an HTTP GET request with parameter returns the result is the HTML of the login success interface, or the HTML of the login failure interface

Import Requests,time,urllib

Req1=requests.get ("http://www.baidu.com")

Print Req1.content

Time.sleep (5) #---------5 seconds after the next step

Req2=requests.get ("http://www.sougou.com")

Print Req2.content

Time.sleep (5) #---------5 seconds after the next step

Req3=urllib.urlopen ()

Always multiple simple page crawls with 5 second intervals in the middle

Import Urllib,urllib2

url = ' Https://api.douban.com/v2/book/user/ahbei/collections '
data={' status ': ' read ', ' rating ': 3, ' tag ': ' Novel '}

Data=urllib.urlencode (data)

Req=urllib2. Request (Url,data)

Res=urllib2.urlopen (req)

Print Res.read ()

This is a standard post request, but due to multiple visits to the site, it is easy for IP to be blocked

Import Urllib,urllib2

url = ' Https://api.douban.com/v2/book/user/ahbei/collections '
data={' status ': ' read ', ' rating ': 3, ' tag ': ' Novel '}

Data=urllib.urlencode (data)

req=url+ '? ' +data #----------------different than the above POST request

Res=urllib2.urlopen (req)

Print Res.read ()

This is a GET request with parameters

Import Urllib,urllib2

body_json{

}

Req=urllib2. Request ("Http://www.baidu.com/login", Data=urllib.urlencode (Body_json))

Res=urllib2.urlopen (req)

Print Res.read ()

This is a POST request with the body part

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Python web crawler