def drag_and_drop(self, source, target):
        self.click_and_hold(source)
        self.release(target)
        return self
Holds down the left mouse button on the source element,
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/selenium/webdriver/common/action_chains.py/ActionChains.drag_and_drop