Static Class Initialization Question.

[Bruno Desthuilliers]

Thomas Troeger a écrit :
> Hello,
> 
> I have a class that looks like this:
> 
> class A(object):
>     def __init__(self, a=0, b=1):
>         self.a, self.b=a, b
>     
>     def __str__(self):
>         return "%s(%d,%d)" % (type(a).__name__, self.a, self.b)

Given the output example you give, I assume there's a typo here and you 
meant:
           return "%s(%d,%d)" % (type(self).__name__, self.a, self.b)


> I want to have a list of such classes instantiated automatically on 
> startup of my program. My current (most probably clumsy) implementation 
> looks like this:
> 
> bla=[A(x[0], x[1]) for x in ((1, 2), (3, 4))]

Not clumsy at all, and almost perfectly pythonic. The only improvment I 
can think of is:

bla = [A(*args) for args in ((1,2), (3,4))]


> giving the following:
> 
>  >>> map(str, bla)
> ['A(1,2)', 'A(3,4)']
> 
> Is there a better way to construct a list of such classes?

Note that it's not a list of classes, but a list of instances of A. But 
given your specs, nope, your approach is the right one.

> Basically 
> what I want is something similar to the following C example:
> 
> struct {
>     int a;
>     int b;
> } bla[]={ {1, 2}, {3, 4} };

Basically (no pun intended[1]), Python is not C. Trying to write C in 
Python will only buy you pain and frustration (and this can be 
generalized for any combination of two languages for any known 
programming language).

[1] well... in fact, yes... !-)