#Ps:urllib常和urllib2結合使用
作爲一個Python菜鳥,之前一直懵懂於urllib和urllib2,以爲2是1的升級版。今天看到老外寫的一篇《Python: difference between urllib and urllib2》才明白其中的區別。
You
might be intrigued by the existence of two separate URL modules in Python -urllib
and urllib2
.
Even more intriguing: they are not alternatives for each other. So what is the difference between urllib
and urllib2
,
and do we need them both?
你可能對於Python中兩個獨立存在的-urllib2和-urllib2感到好奇。更有趣的是:它們並不是可以相互代替的。那麼這兩個模塊間的區別是什麼,並且這兩個我們都需要嗎?
urllib
and urllib2are
both Python modules that do URL request related stuff but offer different functionalities. Their two most significant differences are listed below:
urllib 和urllib2都是接受URL請求的相關模塊,但是提供了不同的功能。兩個最顯著的不同如下:
urllib2
can accept aRequest
object to set the headers for a URL request,urllib
accepts only a URL. That means, you cannot masquerade your User Agent string etc.urllib2可以接受一個Request類的實例來設置URL請求的headers,urllib僅可以接受URL。這意味着,你不可以僞裝你的User Agent字符串等。
urllib
provides theurlencode
method which is used for the generation of GET query strings,urllib2
doesn't have such a function. This is one of the reasons whyurllib
is often used along withurllib2
.urllib提供urlencode方法用來GET查詢字符串的產生,而urllib2沒有。這是爲何urllib常和urllib2一起使用的原因。
For other differences between urllib
and urllib2
refer
to their documentations, the links are given in the References section.
Tip: if you are planning to do HTTP stuff only, check out httplib2,
it is much better than httplib or urllib or urllib2.
提示:如果你僅做HTTP相關的,看一下httplib2,比其他幾個模塊好用。