>>> foo = Foo(42)
>>> foo.some_value
42
>>> foo.some_value = 5
>>> foo.some_value
5
>>> class Foo(object):
….def __init__(self, some_value):
……..self._some_value = some_value

….def some_value(self):
……..return self._some_value

>>> foo = Foo(42)
>>> foo.some_value
42
>>> foo.some_value = 5

Traceback (most recent call last):
..File “”, line 1, in
….foo.some_value = 5
AttributeError: can't set attribute
>>>]]>