closure_class.py

surrounding_y = None

class ClosureClass:
    def __init__(self, x):
        self.x = x
        self.y = surrounding_y
    def __repr__(self):
        return '{}, {}'.format(self.x, self.y)

def make_closure_class(y):
    global surrounding_y
    surrounding_y = y
    return ClosureClass

Test = make_closure_class('seems to work')

test = Test('this is x')
test2 = Test('this is another x')

AnotherTest = make_closure_class('Even different captures do')
test3 = AnotherTest('different y')

# This does not work since the surrounding_y already points to
# something different
test4 = Test('this breaks')

print test
print test2
print test3
print test4