En Fri, 28 Aug 2009 15:25:55 -0300, zaur <szp...@gmail.com> escribió:
On 28 авг, 16:07, Bruno Desthuilliers <bruno.
42.desthuilli...@websiteburo.invalid> wrote:
zaur a écrit :
> 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?
Welcome to dynamic languages! It doesn't matter *where* the class was
defined. You may add new attributes to the instance (even methods to the
class) at any time.
1)
person = Person()
vars(person).update(name="john",age=30,address=Address())
vars(person.Address).update(street="Green Street",no=12)
2)
def the_initializer_i_would_like(person, name, age):
person.name = name
person.age = age
person = Person()
the_initializer_i_would_like(person, name="john", age=30)
3)
def the_initializer_i_would_like(self, name, age):
self.name = name
self.age = age
Person.init = the_initializer_i_would_like
person = Person()
person.init(name="john", age=30)
4)
def a_generic_updater(obj, **kw):
try: ns = vars(obj)
except Exception: ns = None
if ns is not None:
ns.update(kw)
else:
for name in kw:
setattr(obj, name, kw[name])
person = Person()
a_generic_updater(person, name="john", age=30)
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
