How to mock imported variable for file that is imported in __init__.py

Question

I have the following files:

module/MyClass.py

from X import Y    
class MyClass:
    def do_things():
        #does things with Y

module/__init__.py

from .MyClass import MyClass

test.py

def test_myclass():
    with patch('module.MyClass.Y', 'mocked value'):
        MyClass.do_things()

I find that it is impossible to mock the value of Y in this situation. When I try to mock Y, I get the error:

AttributeError: <class 'module.MyClass.MyClass'> does not have the attribute 'Y'

Which makes somewhat sense

As a workaround I have created a method in MyClass:

from X import Y    
class MyClass:

    def get_Y():
        return Y

    def do_things():
        #does things with get_Y()

I can mock this method. But it feels clunky to have to create a method just for mocking in production code. Is there a better solution that I am not seeing?