I can't get the whole source code of an HTML page

Question

Using Python, I want to crawl data on a web page whose source if quite big (it is a Facebook page of some user).

Say the URL is the URL I am trying to crawl. I run the

Answer 1

This page may execute some javascript and javascript generates some content.
Try Twill.
It based on Mechanize, but executes javascript.
Sample in Python:

from twill.commands import *
go("http://google.com/")
fv("f", "q", "test")
submit("btnG")
info() #shows page info
show() #shows html

Another option is to use Zombie.js on Node.js.
This library works even better then Twill and it is browserless solution.
Sample in Coffeescript:

zombie = require "zombie"
browser = new zombie()
browser.visit "https://www.google.ru/", =>
    browser.fill "q", "node.js"
    browser.pressButton "Поиск в Google", ->
        for item in browser.queryAll "h3.r a"
            console.log item.innerHTML