In general, you shouldn't use exec() at all.
First and best option, make self.button be a list of buttons, so that
you can write self.button[index].
You may be working with an object structure you can't control (like
glade or something), in which case use getattr:
self.grid.add(getattr(self, 'button%d' % index))
You could put this getattr behind a method, so that you don't have to
repeat it at each site where you need to refer to a button by index:
def button(self, i): return getattr(self, 'button%d' % index)
...
def anothermethod(self):
self.grid.add(self.button(index))
Jeff
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