Get soup on javascript enabled site

Notes on how to get various soups. It seems that you have to use selenium if you have a site where javascript is valid, such as google image search.

get_soup.py

#-*- coding:utf-8 -*-

from bs4 import BeautifulSoup

def get_soup_uulib2(url):
  import urllib2
  opener = urllib2.build_opener()
  opener.addheaders = [('User-agent', 'Mozilla/5.0')]
  page = opener.open(url)
  soup = BeautifulSoup(page,"lxml")
  return soup

def get_soup_urequests(url):
  import requests
  s = requests.Session()
  r = s.get(url)
  soup = BeautifulSoup(r.text,"lxml")
  print soup

def get_soup_uselenium(url):
  from selenium import webdriver
  #need chromedriver #https://sites.google.com/a/chromium.org/chromedriver/downloads
  chromedriver = "./chromedriver"
  driver = webdriver.Chrome(chromedriver)
  driver.get(url)
  page_source= driver.page_source
  soup=BeautifulSoup(page_source,"lxml")
  return soup
 
#javascript=enable
print get_soup_uselenium("https://www.google.co.jp/search?q=Cat")
#java=off
#print get_soup_uulib2("https://www.google.co.jp/search?q=Cat")
#print get_soup_uulib2("https://www.google.co.jp/search?q=Cat")

Task

It is troublesome to start up the browser one by one. I googled headless selenium and tried various things, but gave up. Can anyone please tell me?

Postscript 7/19

For HEADless (does not launch the browser) Just set driver = webdriver.PhantomJS (). Enter with brew install phantomjs etc.