ToDo: Validate CAM number and Valid Aperture Value

def __vCmdSetCamAperture(self, args):
        '''ToDo: Validate CAM number and Valid Aperture Value'''
        if len(args) == 1:
            for cam in self.camera_list:
                cam.boSetAperture(int(args[0]))
        elif len(args) == 2:
            cam = self.camera_list[int(args[1])]
            cam.boSetAperture(int(args[0]))
        else:
            print ("Usage: setCamAperture APERTURE [CAMNUMBER], APERTURE is value x10")