Object's nesting scope

[Bruno Desthuilliers]

zaur a écrit :
> On 28 авг, 16:07, Bruno Desthuilliers <bruno.
> 42.desthuilli... at websiteburo.invalid> wrote:
>> zaur a écrit :
>>
>>
>>
>>> On 26 авг, 17:13, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>>> Whom am we to judge? Sure if you propose this, you have some usecases in
>>>> mind - how about you present these
>>> Ok. Here is a use case: object initialization.
>>> For example,
>>> person = Person():
>>>   name = "john"
>>>   age = 30
>>>   address = Address():
>>>      street = "Green Street"
>>>      no = 12
>>> vs.
>>> person = Person()
>>> person.name = "john"
>>> person.age = 30
>>> address = person.address = Address()
>>> address.street = "Green Street"
>>> address.no = 12

>> Err... Looks like you really should read the FineManual(tm) -
>> specifically, the parts on the __init__ method.
>>
>> class Person(object):
>>     def __init__(self, name, age, address):
>>         self.name = name
>>         self.age = age
>>         self.address = address
>>
>> class Address(object):
>>     def __init__(self, street, no):
>>         self.no = no
>>         self.street = street
>>
>> person = Person(
>>     name="john",
>>     age=30,
>>     address = Address(
>>         street="Green Street",
>>         no=12
>>     )
>> )
> 
> What are you doing if 1) classes Person and Address imported from
> foreign module 2) __init__ method is not defined as you want?

Either 1/write an alternate initializer and bind it to the appropriate 
classes or 2/write factory functions:

1/

from foreign_module import Person, Address

def my_init(self, **kw):
     for k, v in kw.items():
         setattr(self, k, v)
     return self

Person.init = my_init
Address.init = my_init

person = Person().init(
      name="john",
      age=30,
      address = Address().init(
          street="Green Street",
          no=12
      )
  )


2/

from functools import partial
import foreign_module

def my_factory(cls, **kw):
     obj = cls()
     for k, v in kw.items():
         setattr(obj, k, v)
     return obj

Person = partial(my_factory, foreign_module.Person)
Address = partial(my_factory, foreign_module.Address)

person = Person(
      name="john",
      age=30,
      address = Address(
          street="Green Street",
          no=12
      )
  )