[Tutor] exercise with classes

[Tonu Mikk]

Now I get an error:  NameError: global name 'self' is not define.

Tonu

On Mon, Feb 6, 2012 at 10:19 AM, Nate Lastname <defensoft at gmail.com> wrote:

> Hey Tonu,
>
> The problem is that in your statement definition, you are not
> including the self argument.  Your definition needs to be something
> like:
> def dolt(self):
>   # Do stuff.
> For more info on the self keyword, see
> http://docs.python.org/tutorial/classes.html, section 9.3.2.
>
> On 2/6/12, Tonu Mikk <tmikk at umn.edu> wrote:
> > Alan, thanks for explaining about passing objects to classes.  This is an
> > important concept for me to understand.
> >
> > I tried running the code, but run into an error that I could not resolve:
> >
> > TypeError: doIt() takes no arguments (1 given).
> >
> > Tonu
> >
> > On Thu, Feb 2, 2012 at 7:09 PM, Alan Gauld <alan.gauld at btinternet.com
> >wrote:
> >
> >> On 02/02/12 17:36, Tonu Mikk wrote:
> >>
> >>  So far I have searched for info on how to pass variables from one class
> >>> to another and have been able to create a small two class program
> >>> (attached).   But I seem unable to generalize from here and apply this
> >>> to the game exercise.  What would you suggest for me to try next?
> >>>
> >>
> >> Remember that OOP is about creating objects from classes.
> >> You can pass an object to another rather than just the
> >> variables, in fact its preferable!
> >>
> >> Also remember that you can create many objects from one class.
> >> So just because you have one Room class doesn't mean you are
> >> stuck with one room object. You can have many and each can
> >> be connected to another.
> >>
> >> You can get rooms to describe themselves, you can enter a room.
> >> You might even be able to create new rooms or destroy existing ones.
> These
> >> actions can all be methods of your Room class.
> >>
> >> Here is an example somewhat like yours that passes objects:
> >>
> >> class Printer:
> >>   def __init__(self,number=0):
> >>      self.value = number
> >>   def sayIt(self):
> >>      print self.value
> >>
> >> class MyApp:
> >>   def __init__(self, aPrinter = None):
> >>       if aPrinter == None:     # if no object passed create one
> >>          aPrinter = Printer()
> >>       self.obj = aPrinter      # assign object
> >>   def doIt()
> >>       self.obj.sayIt()         # use object
> >>
> >> def test()
> >>   p = Printer(42)
> >>   a1  MyApp()
> >>   a2 = MyApp(p)   # pass p object into a2
> >>   a1.doIt()   # prints default value = 0
> >>   a2.doIt()   # prints 42, the value of p
> >>
> >> test()
> >>
> >> HTH,
> >>
> >> --
> >> Alan G
> >> Author of the Learn to Program web site
> >> http://www.alan-g.me.uk/
> >>
> >>
> >> ______________________________**_________________
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> >>
> >
> >
> >
> > --
> > Tonu Mikk
> > Disability Services, Office for Equity and Diversity
> > 612 625-3307
> > tmikk at umn.edu
> >
>
>
> --
> My Blog - Defenestration Coding
>
> http://defenestrationcoding.wordpress.com/
>



-- 
Tonu Mikk
Disability Services, Office for Equity and Diversity
612 625-3307
tmikk at umn.edu
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