code: def tap(self, locator, x_offset=None, y_offset=None, count=1):
          
          driver = self._current_application()
          el = self._element_find(locator, True, True)
          action = TouchAction(driver)
          action.tap(el,x_offset,y_offset, count).perform()
docs: Tap element identified by ``locator``.
  
          Args:
          - ``x_offset`` - (optional) x coordinate to tap, relative to the top left corner of the element.
          - ``y_offset`` - (optional) y coordinate. If y is used, x must also be set, and vice versa
          - ``count`` - can be used for multiple times of tap on that element