Python mocked side effect is returning a mocked object instead of the value

I did some research on side effects and as I understand it it's supposed to have the values pulled from an iterable on each call. But I'm not sure why it's not printing 1, 2 but instead

<MagicMock name='bar' id='4448537616'>
<MagicMock name='bar' id='4448537616'>

class Foo():
    def __init__(self):
        self.bar = 'foo'
        pass

from unittest import mock

def test_foo():
    f = Foo()
    with mock.patch.object(f, 'bar', side_effect=[1,2]) :
        print(f.bar)
        print(f.bar)

test_foo()

But if I do f.bar() I get the actual value, but bar is supposed to be an attribute not a function.

Is my understanding of how side_effects work incorrect?