Function to avoid a global variable

[ast]

Le 28/04/2020 à 09:39, Antoon Pardon a écrit :
> 
> 
> Op 27/04/20 om 18:39 schreef Bob van der Poel:
>> Thanks Chris!
>>
>> At least my code isn't (quite!) as bad as the xkcd example :)
>>
>> Guess my "concern" is using the initialized array in the function:
>>
>>     def myfunct(a, b, c=array[0,1,2,3] )
>>
>> always feels like an abuse.
>>
>> Has anyone seriously considered implementing  a true static variable in a
>> function? Is there a PEP?
> 
> You can emulate a static variable is with a closure.
> 
> def make_parseStack():
> 
>      depth = 0
> 
>      def parseStack(inc):
>         nonlocal depth
> 
>          if depth > 50:
>              ... report error and die nicely
>          depth += inc
> 
>      return parseStack
> 
> parseStack = make_parseStack()
> 

funny !

So we found 4 different ways to handle a memory in a function

1- Use a function parameter with a mutable default value

2- Use a function attribute

3- Use a callable object, and store your stuff inside an object attr

4- Use a closure to emulate a static function variable

Any more ?