printing a sequence...

Peter Otten __peter__ at web.de
Fri Jul 16 12:37:37 CEST 2004


Florian Preknya wrote:

> Hi everybody,
> 
> I'm relatively new in using Python and I want to perform a simple job: I
> have a list of objects of type A and want to print them to stdout.
> 
> class A:
>     def __init__(self, value):
>         self.value = value
> 
>     def __str__(self):
>         return "value: %d" % self.value
> 
> a = [A(10), A(12), A(2)]
> print str(a)
> 
> I obtain [<__main__.A instance at 0x00767D80>, <__main__.A instance at
> 0x00768698>, <__main__.A instance at 0x00768350>].
> What I want to obtain is [value: 10, value: 12, value: 2].
> 
> I know that if I change the __str__ to __repr__ I obtain what I want, but
> then I will have these informal strings in debuger also, and I do not want
> that.
> 
> Can I write somehow the print statement to force calling the A.__str__
> function?

print map(str, a)

or 

print [str(item) for item in a]

Peter




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