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Re: Immutability and Python

 
 
Ian Kelly
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      10-29-2012
On Mon, Oct 29, 2012 at 10:12 AM, andrea crotti
<(E-Mail Removed)> wrote:
> Also because how doi I make an immutable object in pure Python?


I sometimes use namedtuples for this.

from collections import namedtuple

MyImmutableClass = namedtuple('MyImmutableClass', 'field1 field2 field3 field4')

If you want default arguments then use a factory function. Or if you
want the class to have methods, then subclass it:

_MyImmutableClass = namedtuple('MyImmutableClass', 'field1 field2
field3 field4')

class MyImmutableClass(_MyImmutableClass):

def __new__(cls, field1, field2, field3=None, field4=42):
return super().__new__(cls, field1, field2, field3, field4)

def get_sum(self):
return self.field1 + self.field2

Cheers,
Ian
 
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