How to assign a default constant value in a function declaration

[Scott David Daniels]

Marco Bartel wrote:

> rzed wrote:
> 
>> "Vineet Jain" <vineet at eswap.com> wrote in
>> news:mailman.341.1081121191.20120.python-list at python.org:
>>
>>> The following does not work although it seems like something you
>>> should be able to do.
>>>
>>> def someFunction(option=Constants.DEFAULT_VALUE):
>>>

I suspect what the OP wants is to evaluate "Constants.DEFAULT_VALUE"
at function call time, not function definition time.
Indeed, something like the following does not work:

     def someFunction(option=Constants.DEFAULT_VALUE):
         print 'the option was', option

     class Constants:
         DEFAULT_VALUE = 13

     someFunction()

In fact:
     class Constants:
         DEFAULT_VALUE = 13

     def someFunction(option=Constants.DEFAULT_VALUE):
         print 'the option was', option

     Constants.DEFAULT_VALUE = 7  # get luckier

     someFunction()

prints 13, not the possibly desired 7.



>> Do you mean in a context like this?
>>    class Const:
>>        someVal=255
>>        otherVal=0
>>
>>    def blip(Const.someVal):
Should be:
       def blip(test=Const.someVal):
> 
> i checked this out, and i think its the name you were using:
> Const
Nope, it is the missing arg name.

-- 
-Scott David Daniels
Scott.Daniels at Acm.Org