How to use cython functions from other cython cells in notbook?

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Hi, I'm currently using sage with the notebook interface. How can I define a function in a cython cell and use it in another cython cell?

I understand I need to import the first cython module but the name changes after every evaluation.

Also being able to do this directly from notebook (without writing a separate cython file) and from separate cells would be handy.

For example this works fine:

cell1:

%cython
def test(int n):
    return 2*n

cell 2:

def test2(m):
    return test(m)

cell 3:

test2(3)
5

but this does not:

cell 4:

%cython
def test3(int m):
    return test(m)
pyx:7:15: undeclared name not builtin: test

Thank you :)