Chris Angelico於 2019年5月18日星期六 UTC+8下午3時09分37秒寫道： > On Sat, May 18, 2019 at 1:51 PM <jf...@ms4.hinet.net> wrote: > > > > Correct me if I am wrong, please. > > > > I always think that the LEGB rule (e.g. the namespace to look up for) was > > applied at compile-time, only the binding was resolved "dynamically" at > > run-time. For example: > > > > def foo(): > > print(x) > > > > foo() will cause a NameError. But after > > > > x = 5 > > > > foo() will run correctly. > > This is correct; however, this function will fail with UnboundLocalError: > > x = 1 > def foo(): > print(x) > x = 2 > > Function locals ARE locked in at compile time. > > ChrisA
Thank you. This example proves that the LEGB rule was applied at compile-time, and it fails to resolve the binding at run-time. --Jach -- https://mail.python.org/mailman/listinfo/python-list
