Python Selenium WebDriver drag-and-drop

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()

Reference

It's hard to tell exactly without some sample HTML for the source and the target.

You could try using drag_and_drop_by_offset(self, source, xoffset, yoffset) instead with a small value for the offset parameters. Sometimes that works.

You could also try to adapt this C# example which uses mouse_down_at, mouse_move_at and mouse_up_at instead.

action = ActionChains(driver)
action.click_and_hold(source).pause(4).move_to_element(target).release(target).perform()

This will also do drag and drop.

Action Chains don't currently work on Mac. If you tried the code above on Linux or Windows it would work. ChromeDriver is close to getting this right but still needs work AFAIK.