jf...@ms4.hinet.net wrote: > I study some codes of a tutorial about tkinter > > [snip code] > > My question is that the object which was left by > callit(self.demoenter_callback, tag) is a callit instance, > and the method it calls is a DemoMainWindow's method. How > it is possible?
Why would it _not_ be possible? Functions are first class objects, after all. Google it. All the code is doing here is passing around a function reference and argument list like a baton in a foot race. No real magic here, just a lot of academic smoke and mirrors really. Or maybe this is more like a rat maze? Or a hot potato? Opinions may vary... But short of obfuscation for the _sake_ of obfuscation, i don't understand what the tutorial author is intending to teach you here. Sheesh, the same goal could be achieved much more clearly by wrapping the argument-laden callback in an anonymous function or using a functools.partial, as the _true_goal_ here is to avoid premature execution of the argument-laden callback. I absolutely detest superfluity! -- >>> import this -- https://mail.python.org/mailman/listinfo/python-list
