default argument value is mutable

[jmp]

On 10/07/2016 02:07 PM, ast wrote:
>
> "jmp" <jeanmichel at sequans.com> a écrit dans le message de
> news:mailman.209.1475841371.30834.python-list at python.org...
>> On 10/07/2016 01:38 PM, Daiyue Weng wrote:
>
>>
>> So the rule of thumb for default argument value is "No mutable"
>>
>> Cheers,
>
>
> It can be used to store some variables from one call of
> a function to an other one.
>
> def test( _store={'x':0}):
>
>     x = _store['x']
>     ..... do some stuff
>    _store['x'] = x

For personal dirty scripts, possibly, for all other situations, never. 
Especially since there's nothing in the code above that cannot be solved 
using standard idioms .

That is if you care about anyone reading your code ;)

jm