What arguments are passed to the __new__ method ?

[Ian Kelly]

On Wed, Mar 2, 2016 at 10:57 AM, Rob Gaddi
<rgaddi at highlandtechnology.invalid> wrote:
> Peter Pearson wrote:
>
>> On Tue, 1 Mar 2016 18:24:12 +0100, ast wrote:
>>>
>>> It's not clear to me what arguments are passed to the
>>> __new__ method. Here is a piece of code:
>>>
>>>
>>> class Premiere:
>>>
>>>     def __new__(cls, price):
>>>          return object.__new__(cls)
>>>
>>>     def __init__(self, price):
>>>             pass
>> [snip]
>>
>> Of course, maybe you don't need to define a __new__ method at all.
>> Personally, I find that __init__ suffices for my simple needs.
>>
>
> I tend to need __init__ on about half of the classes I write.  I think
> I've needed __new__ all of twice in the years I've been writing Python.

Typically there are only two reasons to override __new__: you
potentially want to return an object of a different class than the
class that was called, or you're subclassing an immutable type and
need to handle the superclass arguments before they get passed to the
constructor.