Write a class named Cursor that models an integer $$cursor$.$ When created, the cursor object should have value $0.$ The class should support method curr$()$ that returns the value of the cursor, method next$()$ that increments the value of the cursor, and method prev$()$ that decrements the value of the cursor. Metholds prev$()$ and next$()$ should also return the new value of the cursor. A ValueError exception should be raised if method prev$()$ is called when the cursor value is $0.>>>$ cursor $=$ Cursor$()>>>$ cursor.curr$()0>>>$ cursor.next$()1>>>$ cursor.curr$()1>>>$ cursor.prev$()0>>>$ cursor.curr$()0>>>$ cursor.prev$()$ Traceback $($most recent call last$)$: File $"",$ line $1,$ in cursor.prev$()$ File $"/$Users$/$me$/$ch$8.$py$",$ line $54,$ in prev raise ValueError$(\text{'}$Illegal cursor operation'$)$ ValueError: Illegal cursor operation