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__init__ is the initialiser

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  __init__ is the initialiser Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-01-31 19:33 +0000
    Re: __init__ is the initialiser Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-03 12:23 +1300
      Re: __init__ is the initialiser Roy Smith <roy@panix.com> - 2014-02-02 18:34 -0500

#65135 — __init__ is the initialiser

 From http://docs.python.org/3/reference/datamodel.html#object.__init__ 
which states:-

"
Called when the instance is created. The arguments are those passed to 
the class constructor expression. If a base class has an __init__() 
method, the derived class’s __init__() method, if any, must explicitly 
call it to ensure proper initialization of the base class part of the 
instance; for example: BaseClass.__init__(self, [args...]). As a special 
constraint on constructors, no value may be returned; doing so will 
cause a TypeError to be raised at runtime.
"

Should the wording of the above be changed to clearly reflect that we 
have an initialiser here and that __new__ is the constructor?

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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#65293

Mark Lawrence wrote:
> Called when the instance is created. The arguments are those passed to 
> the class constructor expression. If a base class has an __init__() 
> method, the derived class’s __init__() method, if any, must explicitly 
> call it to ensure proper initialization of the base class part of the 
> instance; for example: BaseClass.__init__(self, [args...]). As a special 
> constraint on constructors, no value may be returned; doing so will 
> cause a TypeError to be raised at runtime.
> "
> 
> Should the wording of the above be changed to clearly reflect that we 
> have an initialiser here and that __new__ is the constructor?

The first instance of "constructor" in that paragraph refers
to the expression used to instantiate an object, e.g.
'MyClass(foo, blarg)', which is fine.

The second instance might be clearer if it said "as a special
constraint on the __init__ method" and avoided the word
"constructor" altogether.

Generally I think it would be better to talk about "the
__new__ method" and "the __init__ method", and not call
either of them a constructor.

-- 
Greg

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#65295

In article <bl82apFh3sbU1@mid.individual.net>,
 Gregory Ewing <greg.ewing@canterbury.ac.nz> wrote:

> Generally I think it would be better to talk about "the
> __new__ method" and "the __init__ method", and not call
> either of them a constructor.

+1

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