Query or modify the coordinates of an item. With only tagOrId, return a list of the floating-point coordinates of the item given by tagOrId (the first matching item if it matches several). Given new coordinates, replace the coordinates of that item with them; like the create_* methods, the coordinates may be given as separate numbers, as a single sequence, or as coordinate pairs. The returned coordinates are always in pixels, regardless of the units used to specify them; for rectangles, ovals and arcs they are ordered left, top, right, bottom.
3.12: The arguments are now flattened: the coordinates may be given as separate arguments, as a single sequence, or grouped in pairs, like the create_* methods.