I think I got it......finally.......*grin* I will try to put this in practice right away and let you know if I have so more problems or if I didn't understand what I think I did.
jeje Thank you Jhon and Danny Best Regards, Alberto >From: [EMAIL PROTECTED] >To: "tutor@python.org" <tutor@python.org> >Subject: Re: [Tutor] Minesweeper the return >Date: Wed, 20 Jul 2005 11:18:09 +1200 (NZST) > >Quoting Alberto Troiano <[EMAIL PROTECTED]>: > > > Please let's talk about this more! *grin* > > I'm not sure if I'm following you, what I see here is a function inside > > other function and the first function returns its inside function, but > > how does it work? > >In Python, as in other modern languages, functions are "first-class" >objects. >In particular, you can pass functions as arguments to other functions, or >return >functions from other functions. > >I like examples: > > >>> def add(x, y): >... return x + y >... > >>> f = add # Notice the lack of brackets after 'add' > >>> f(3, 5) >8 > >>> f(9, 12) >21 > >In this case, all I've done is assigned to f the function 'add'. This >means >that f is now a function, and I can call it, even though I never did 'def >f(x, >y)' anywhere. > > >>> def square(x): >... return x*x >... > >>> range(10) >[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] > >>> map(square, range(10)) >[0, 1, 4, 9, 16, 25, 36, 49, 64, 81] > >The 'map' builtin function takes two arguments: a function and a list. It >makes >a new list by applying the function to each element of the old list. >ie: This is an example of passing a functino as an argument. > >Finally: > > >>> def makeAdder(x): >... def add(y): >... return x + y >... return add >... > >>> f = makeAdder(5) > >>> f(3) >8 > >>> f(8) >13 > >'def add(y)' defines a function of one argument, which adds that argument >to x, >and returns the result. What is x? Well, x is a variable in the scope of >makeAdder(); it gets bound to the argument you pass. In my example, x was >bound >to 5. So, effectively, we have created a new function by: 'def add(y): >return 5 >+ y', and then returned that function to f. We can now call f and see the >result. > >HTH! > >-- >John. > >[ps: sorry for the troll.. I couldn't resist :-) ] >_______________________________________________ >Tutor maillist - Tutor@python.org >http://mail.python.org/mailman/listinfo/tutor Gaucho _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
