On Jun 7, 12:03 am, "Gabriel Genellina" <gagsl-...@yahoo.com.ar> wrote: > En Sat, 28 May 2011 14:05:16 -0300, Steven D'Aprano > <steve+comp.lang.pyt...@pearwood.info> escribi : > > > > > > > > > > > On Sat, 28 May 2011 09:39:08 -0700, John Nagle wrote: > > >> Python allows patching code while the code is executing. > > > Can you give an example of what you mean by this? > > > If I have a function: > > > def f(a, b): > > c = a + b > > d = c*3 > > return "hello world"*d > > > how would I patch this function while it is executing? > > I think John Nagle was thinking about rebinding names: > > def f(self, a, b): > while b>0: > b = g(b) > c = a + b > d = self.h(c*3) > return "hello world"*d > > both g and self.h may change its meaning from one iteration to the next, > so a complete name lookup is required at each iteration. This is very > useful sometimes, but affects performance a lot. >
And even the original example, with only + and * can have side- effects. Who knows how a defines __add__? Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
