1. 程式人生 > >Python常用庫urllib中urllib.request模組使用詳解

Python常用庫urllib中urllib.request模組使用詳解

 1.urllib2和urllib庫的區別     

     Urllib庫是Python中的一個功能強大、用於操作URL,並在做爬蟲的時候經常要用到的庫。在Python2.x中,分為Urllib庫和Urllin2庫,Python3.x之後都合併到Urllib庫中了。實際開發中,用Requests多餘urllib.

   這裡介紹使用的python3中的urllib庫包括以下模組

  1. urllib.request 請求模組
  2. urllib.error 異常處理模組
  3. urllib.parse url解析模組
  4. urllib.robotparser robots.txt   解析模組

    urllib和urllib2庫中模組的主要變化有:

  1. 在Pytho2.x中使用import urllib2=====>在Python3.x中會使用import urllib.request,urllib.error。
  2. 在Pytho2.x中使用import urllib=====>在Python3.x中會使用import urllib.request,urllib.error,urllib.parse。
  3. 在Pytho2.x中使用import urlparse=====>在Python3.x中會使用import urllib.parse。
  4. 在Pytho2.x中使用import urlopen=====>在Python3.x中會使用import urllib.request.urlopen。
  5. 在Pytho2.x中使用import urlencode=====>在Python3.x中會使用import urllib.parse.urlencode。
  6. 在Pytho2.x中使用import urllib.quote=====>在Python3.x中會使用import urllib.request.quote。
  7. 在Pytho2.x中使用cookielib.CookieJa=====>在Python3.x中會使用http.CookieJar。
  8. 在Pytho2.x中使用urllib2.Request——-對應的,在Python3.x中會使用urllib.request.Request。

2. python3中的urllib的使用詳解

     學習的官方文件地址:urllib的官網學習文件地址

3.urllib.request 請求模組的使用詳解

 3.1 urllib.request.urlopen的用法

    urlopen使用格式與引數解釋:

     urllib.request.urlopen(url, data=None, [timeout, ]*, cafile=None, capath=None, cadefault=False, context=None)

  1.urlopen()只有一個引數url

import urllib.request

response = urllib.request.urlopen('http://www.baidu.com')
print(response.read().decode('utf-8'))
注意如果在pycharm非命令列模式直接用print(response.read())即可。

使用response物件的read()方法讀取網頁內容,然後打印出來,因為讀取的網頁內容位元組流,所以要列印時要轉成utf-8格式
讀取內容常見的有3種方式,其用法是: 
1. read()讀取檔案的全部內容,與readlines()不同的是,read()會把讀取到的內容賦給一個字串變數。 
2. readlines()讀取檔案的全部內容,readlines()會把讀取到的內容賦值給一個列表變數。 
3. readline()讀取檔案的一行內容。
--------------------- 

1.這是時候可以將爬取的網頁內容儲存到本地
#注意這裡response物件的內容只能讀取一次,使用一次read(),再次read()是空值,跟一般檔案讀取一樣。

'''方法1:將爬取的網頁內容儲存到本地
f = open('./a.html','wb')
f.write(t)
f.close()'''

#方法2:儲存為html檔案,可以直接使用瀏覽器開啟驗證。
with open('./b.html','wb') as f:
    f.write(t)
    f.close()

2.可以指定顯示爬取的網頁中部分資訊
print(response.info())
print(response.geturl())
print(response.getcode())

 如上:可以看出,urlopen中的引數除了請求網頁url是必須的,其餘都是可選擇的引數,同樣如下:

from urllib import request

with request.urlopen('https://baidu.com') as f:
    data = f.read()  #讀取響應的資料
    print('Status:', f.status, f.reason)
    for k, v in f.getheaders():  #遍歷列印響應頭資料,json格式,跟瀏覽器格式一樣
        print('%s: %s' % (k, v))
    print('Data:', data)  #如果在互動模式下,需要是用decode()進行轉換

'''程式執行結果如下:
Status: 200 OK
Date: Thu, 20 Dec 2018 08:10:48 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: Close
Vary: Accept-Encoding
Set-Cookie: BAIDUID=348DA5244A4C87E823EE2DC9D5659A14:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: BIDUPSID=348DA5244A4C87E823EE2DC9D5659A14; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: PSTM=1545293448; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie: delPer=0; path=/; domain=.baidu.com
Set-Cookie: BDSVRTM=0; path=/
Set-Cookie: BD_HOME=0; path=/
Set-Cookie: H_PS_PSSID=26525_1423_21078_18560_28132_26350_27750_28140; path=/; domain=.baidu.com
P3P: CP=" OTI DSP COR IVA OUR IND COM "
Cxy_all: baidu+02d0ae63f27832db9f1ff400b8273995
Cache-Control: private
Expires: Thu, 20 Dec 2018 08:10:40 GMT
Server: BWS/1.1
X-UA-Compatible: IE=Edge,chrome=1
BDPAGETYPE: 1
BDQID: 0x8b38ae5c0005a450
Data: b'<!DOCTYPE html>\n<!--STATUS OK-->\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\t\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\t\r\n        \r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\t\t    \r\n\r\n\t\r\n        \r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\t\t    \r\n\r\n\r\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n<html>\n<head>\n    \n    <meta http-equiv="content-type" content="text/html;charset=utf-8">\n    <meta http-equiv="X-UA-Compatible" content="IE=Edge">\n\t<meta content="always" name="referrer">\n    <meta name="theme-color" content="#2932e1">\n    <link rel="shortcut icon" href="/favicon.ico" 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