Reference or Value?

[Christian Heimes]

Torsten Mohr schrieb:
> Hi,
> 
> how is the rule in Python, if i pass objects to a function, when is this
> done by reference and when is it by value?
> 
> def f1(a):
>     a = 7
> 
> b = 3
> f1(b)
> print b
> => 3
> 
> Integers are obviously passed by value, lists and dicts by reference.
> 
> Is there a general rule?  Some common formulation?

Python uses neither call by reference nor call by value. It's called
call by sharing or call by object. http://effbot.org/zone/call-by-object.htm

Christian