Goal: Learn to write accessor and mutator methods for stateful objects. $($Python$)$

Assignment: Write a class named Calculator that works the following way:

The $\_\_$init$\_\_$ method takes a single float parameter and assigns it to $\_\_$value;

The add method takes a single float parameter, sums it to $\_\_$value and stores it again in $\_\_$value;

The subtract method takes a single float parameter, subtracts it from $\_\_$value and stores it again in $\_\_$value;

The multiply method takes a single float parameter, multiplies it with $\_\_$value and stores it again in $\_\_$value;

The divide method takes a single float parameter, divides $\_\_$value by it$,$ stores it again in $\_\_$value and returns None. If the parameter is $0,$ return "You can't divide by zero!" and do not change the value of $\_\_$value;

The get$\_$result method takes no parameters and returns the value of $\_\_$value.