Challenge: Reimplementing property

1. Implement a class SimpleProperty with:
   • __init__(self, fget=None, fset=None, fdel=None) that stores all three functions;
   • __get__(self, obj, objtype=None) that returns self when obj is None, raises AttributeError if fget is None, otherwise calls and returns fget(obj);
   • __set__(self, obj, value) that raises AttributeError if fset is None, otherwise calls fset(obj, value);
   • __delete__(self, obj) that raises AttributeError if fdel is None, otherwise calls fdel(obj);
   • a setter(self, fset) method that returns a new SimpleProperty with the same fget and fdel but the new fset;
   • a deleter(self, fdel) method that returns a new SimpleProperty with the same fget and fset but the new fdel.
2. Apply SimpleProperty to the Portfolio class below:
   • decorate value with @SimpleProperty as the getter;
   • use @value.setter to add a setter that stores the value in self._value if it is non-negative, otherwise raises ValueError;
   • use @value.deleter to add a deleter that sets self._value to 0.0.
3. Create an instance called portfolio with portfolio_id="PF-001" and value=50000.0.
4. Store portfolio.value in a variable called initial_value.
5. Set portfolio.value to 75000.0, then store the new value in updated_value.
6. Print initial_value and updated_value.

class Portfolio:
    def __init__(self, portfolio_id, value):
        self.portfolio_id = portfolio_id
        self._value = value