I cannot get drag-and drop working with the Python WebDriver bindings. I am working with Google Chrome and Firefox on Mac OS X. There is a thread here where someone had a similar problem.
I have tried using ActionsChains:
from selenium import webdriver
from selenium.webdriver import ActionChains
driver = webdriver.Chrome()
actionChains = ActionChains(driver)
actionChains.drag_and_drop(source, target).perform()
Have you managed to get the Python WebDriver drag-and-drop working?
For the sake of giving an updated answer, I have verified that this does in fact work on Mac now.
from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains
driver = webdriver.Firefox()
driver.get("your.site.with.dragndrop.functionality.com")
source_element = driver.find_element_by_name('your element to drag')
dest_element = driver.find_element_by_name('element to drag to')
ActionChains(driver).drag_and_drop(source_element, dest_element).perform()