[Tutor] functions and default argument

[Christian Witts]

On 2011/10/21 03:00 PM, Praveen Singh wrote:
> In function-
>
> "Default value is *evaluated only once*.This makes different when the 
> default is a mutable object such as a list, dictionary or instance of 
> most classes."
>
> I am not getting it properly-evaluated once?? different behaviour???-- 
> please explain this.
>
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Mutable defaults for function/method arguments is a Python Gotcha, you 
can find a good read here [1].  It's a better read than how I would 
explain it.

[1] http://www.ferg.org/projects/python_gotchas.html#contents_item_6
-- 

Christian Witts
Python Developer

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