Attack a sacred Python Cow

Nikolaus Rath Nikolaus at rath.org
Sat Jul 26 11:08:12 CEST 2008


Terry Reedy <tjreedy at udel.edu> writes:
> Nikolaus Rath wrote:
>> Terry Reedy <tjreedy at udel.edu> writes:
>>> Torsten Bronger wrote:
>>>> Hallöchen!
>>>  > And why does this make the implicit insertion of "self" difficult?
>>>> I could easily write a preprocessor which does it after all.
>>> class C():
>>>   def f():
>>>     a = 3
>>>
>>> Inserting self into the arg list is trivial.  Mindlessly deciding
>>> correctly whether or not to insert 'self.' before 'a' is impossible
>>> when 'a' could ambiguously be either an attribute of self or a local
>>> variable of f.  Or do you and/or Jordan plan to abolish local
>>> variables for methods?
>>
>> Why do you think that 'self' should be inserted anywhere except in the
>> arg list? AFAIU, the idea is to remove the need to write 'self' in the
>> arg list, not to get rid of it entirely.
>
> Because you must prefix self attributes with 'self.'. If you do not
> use any attributes of the instance of the class you are making the
> function an instance method of, then it is not really an instance
> method and need not and I would say should not be masqueraded as
> one. If the function is a static method, then it should be labeled
> as one and no 'self' is not needed and auto insertion would be a
> mistake. In brief, I assume the OP wants 'self' inserted in the body
> because inserting it only in the parameter list and never using it
> in the body is either silly or wrong.


I think you misunderstood him. What he wants is to write


class foo:
   def bar(arg):
       self.whatever = arg + 1


instead of

class foo:
   def bar(self, arg)
       self.whatever = arg + 1


so 'self' should *automatically* only be inserted in the function
declaration, and *manually* be typed for attributes.

Best,

   -Nikolaus

-- 
 »It is not worth an intelligent man's time to be in the majority.
  By definition, there are already enough people to do that.«
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