def drag_and_drop(self,locator,movementsString):
self.do_command("<STR_LIT>", [locator,movementsString,])<EOL>
Drags an element a certain distance and then drops it

'locator' is an element locator
'movementsString' is offset in pixels from the current location to which the element should be moved, e.g., "+70,-300"