<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def click_a_point(self, x=0, y=0, duration=100):

 """ Click on a point"""

        self._info("Clicking on a point (%s,%s)." % (x,y))
        driver = self._current_application()
        action = TouchAction(driver)
        try:
            action.press(x=float(x), y=float(y)).wait(float(duration)).release().perform()
        except:
            assert False, "Can't click on a point at (%s,%s)" % (x,y)