how to call a class that has all the string that will be used in the application code example

Example: if one program contains more than one clasees wirtten separately are they considerd public class in pyhton

class Robot:
    __counter = 0
    
    def __init__(self):
        type(self).__counter += 1
        
    @staticmethod
    def RobotInstances():
        return Robot.__counter
        

if __name__ == "__main__":
    print(Robot.RobotInstances())
    x = Robot()
    print(x.RobotInstances())
    y = Robot()
    print(y.RobotInstances())
    print(Robot.RobotInstances())