[PIPython] Re: Dati statici

[Carlo C8E Miron]

> From: Luca Fabbri <lucafbb a gmail.com>
> To: python a lists.python.it
> Date: Fri, 25 Feb 2005 11:12:29 +0100
> Subject: [PIPython] Dati statici
> Salve a tutti.
> Provengo dal mondo di programmazione Java.
> Vorrei capire in Python come si definiscono dati (variabili, oggetti)
> statici all'interno di una classe.
> Per i metodi ho trovato staticmethod ma non riesco a trovare
> l'informazione per i dati comuni.

$ ipython 
Python 2.3.5 (#2, Feb  9 2005, 00:38:15) 
Type "copyright", "credits" or "license" for more information.

IPython 0.6.5 -- An enhanced Interactive Python.
?       -> Introduction to IPython's features.
%magic  -> Information about IPython's 'magic' % functions.
help    -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.

In [1]: class spam(object):
   ...:     static_data = [1, 2, 3]
   ...:     def __init__(self, data):
   ...:         self.dynamic_data = data
   ...:         

In [2]: spam.static_data
Out[2]: [1, 2, 3]

In [3]: one = spam(42)

In [4]: two = spam(666)

In [5]: one.static_data, one.dynamic_data
Out[5]: ([1, 2, 3], 42)

In [6]: two.static_data, two.dynamic_data
Out[6]: ([1, 2, 3], 666)

In [7]: one.static_data.append(4)           

In [8]: two.static_data, two.dynamic_data
Out[8]: ([1, 2, 3, 4], 666)

HTH,
    C8E

PS: occhio alla differenza tra *mutare* ed effettuare il rebinding

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