Kristian Domke wrote: > Hello to all > > I am trying to learn python at the moment studying an example program > (cftp.py from the twisted framework, if you want to know) > > There I found a line > > foo = (not f and 1) or 0 > > In this case f may be None or a string. > > If I am not wrong here, one could simply write > > foo = not f > > because if f = None: > > (not f) = true, > (true and 1) = true, > (true or 0) = true > > or if f = 'bar' > > (not f) = false > (false and 1) = false > (false or 0) = false > > So why bothering with the longer version? >
Good catch! It's my guess that you've found a way to improve on a bit of carelessly written code. However there *is* a (subtle) difference between not f and (not f and 1) or 0 The first produces a boolean value, and the second produces an int value, but since one is a subclass of the other, you'd have to write quite perverse code care about the difference. Gary Herron > I hope, I made clear, what I want... > Quite. > CU > > Kristian > -- http://mail.python.org/mailman/listinfo/python-list
