How to retrieve these elements from a webpage?

I have a webpage in HTML with these elements:

<div class="content_page">
    <a href="/earth" class="nametessera" >earth</a>
</div>
<div class="content_page">
    <a href="/world" class="nametessera" >world</a>
</div>
<div class="content_page">
    <a href="/planet" class="nametessera">planet开发者_StackOverflow</a>
</div>
...

I need to retrieve /earth, /world, /planet, etc. so I need to retrieve all links of tag A with class "nametessera".

How can I do this with python ?

Short answer:

Use beautifulSoup to parse the page, get the urls and then use urlib2 or pycurl to download the mentioned urls.

[Edit:]

Adding on to the examples below but to only use the the href contained in the div

>>> alldiv = soup.findAll('div', { "class" : "content_page" })
>>> for div in alldiv: print div.a
... 
<a href="/earth" class="nametessera">earth</a>
<a href="/world" class="nametessera">world</a>
<a href="/planet" class="nametessera">planet</a>
>>> for div in alldiv: print div.a['href']
... 
/earth
/world
/plan

Similarly you could also do

allHref = soup.findAll('a', { "class" : "nametessera" })

You parse the HTML with Beautiful Soup.

The documentation is here.