That seems to work!

I'd just like to add, Armin, that whenever I have a question you are almost always the first to respond and your replies are always very helpful and insightful. It is very much appreciated; thank you. :)

On Thu, Jul 27, 2017 at 11:59 PM Armin Rigo <armin.rigo@gmail.com> wrote:

Hi Tin,

On 27 July 2017 at 16:17, Tin Tvrtković <tinchester@gmail.com> wrote:
> My question is, what's the easiest/most natural way of changing the contents
> of this closure cell on PyPy?

On PyPy you can do (tested on PyPy2):

cell = g.func_closure[0]
cell.__setstate__((43,)) # sets the 'cell_contents' attribute to 43

Armin