there's a secret hack to get your `f_locals` changes to propogate back exec( code_fragment, frame.f_globals, frame.

there's a secret hack to get your `f_locals` changes to propogate back exec( code_fragment, frame.f_globals, frame.f_locals ) # update locals ctypes.pythonapi.PyFrame_LocalsToFast(ctypes.py_object(frame), ctypes.c_int(0)) This sets the values back into the right place on the frame you were operating on. https://pydev.blogspot.jp/2014/02/changing-locals-of-frame-frameflocals.html https://pydev.blogspot.jp/2014/02/changing-locals-of-frame-f...