On Fri, 10 Aug 2018 08:15:09 +0200, Karsten Hilbert wrote: > On Fri, Aug 10, 2018 at 12:24:25AM +0800, xuanwu348 wrote: > >> Yes, move the code from positionA(can run normally) to >> positionB(exception with name undefined) I find this content >> "https://docs.python.org/3.3/tutorial/classes.html#python-scopes-and- namespaces" >> But I still don't undewrstand the differenct of scopes-and-namespaces >> between positionA and positionB, >> >> I think the variable "aLock" at these positionA or positionB are all >> global. > > When something goes wrong in an unexpected way: test your assumptions > ;-)
xuanwu348's assumptions are correct. aLock is a global, in both positions. The problem is not the scope of the variable, but whether or not the variable is assigned to or not. -- Steven D'Aprano "Ever since I learned about confirmation bias, I've been seeing it everywhere." -- Jon Ronson -- https://mail.python.org/mailman/listinfo/python-list
