Python property decorator example

class Test:
    def __init__(self, my_val):
        self._myval = my_val

    @property
    def my_val(self):
        return "Value: {0}".format(self._myval)

    @my_val.setter
    def my_val(self, value):
        raise RuntimeError("My val property is read only")


inst = Test("abc")
print(inst.my_val)
inst.my_val = "xyz"