Hi Tin, On 27 July 2017 at 16:17, Tin Tvrtković <tinchester at 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