[Python-talk] Initializing a class...

[bruce.labitt at autoliv.com]

kent3737 at gmail.com wrote on 09/02/2009 05:39:06 PM:

> On Wed, Sep 2, 2009 at 3:38 PM, <bruce.labitt at autoliv.com> wrote:
> > One thing that I have stumbled upon is that an instance of a class I
> > created is not being initialized as I expected.  I thought (and 
apparently
> > I was wrong -- what a surprise...) that merely creating an instance of 
it
> > was enough.
> >
> > So how does one do this?
> >
> > class myVars:
> 
> BTW
>   class myVars(object):
> is preferred these days.
> 
> >        def __init__(self):
> >                self.bufsize = 32
> >                self.bufdat = zeros(32)
> >                self.fftsize = 1
> >                self.oldfftsize = 0
> >                self.fftinput = zeros(self.fftsize)
> > +1j*zeros(self.fftsize)
> >                self.fftoutput = zeros(self.fftsize) +
> > 1j*zeros(self.fftsize)
> >                self.dt = 1.0e-13
> >
> >        def othermethods:
> >
> > I thought just doing the following was sufficient:
> >
> > c = myVars()
> > print 'FFT initial data is', c.fftinput
> >
> > But I get AttributeError: myVars instance has no attribute 'fftinput'
> >
> > Where am I going astray?  How do I init c?
> 
> Your code looks right to me. For example:
> In [1]: class MyVars:
>    ...:     def __init__(self):
>    ...:         self.fftinput = 3
> 
> In [8]: c = MyVars()
> 
> In [9]: c.fftinput
> Out[9]: 3
> 
> Presumably your real code is not so simple? Is it possible you
> redefined c or myVars somewhere? Try printing dir(c) and type(c) for
> clues.
> 
> Kent


Oh, I'm embarrassed...  It is real simple...

I typed def __init___(self): instead of def __init__(self):

Jeesh, took me a while to find that. 

On your BTW,  do I need to change anything besides

class MyVars(object):

-Bruce



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