Add an attribute to a class dynamically at runtime in Python

Question

When I do the following:

def Welcome(email, temporaryPassword):
    model = object()
    model.TemporaryPassword = temporaryPassword
    model.Email = email

I get an error:

AttributeError: 'object' object has no attribute 'TemporaryPassword'

How do I dynamically create an object like I am doing?

possible duplicate of [python: How to add property to a class dynamically?](http://stackoverflow.com/questions/1325673/python-how-to-add-property-to-a-class-dynamically) — , Sep 12 '11 at 05:09

score 1 · Accepted Answer · answered Sep 12 '11 at 05:09

use lambda object : ( http://codepad.org/ITFhNrGi )

def Welcome(email, temporaryPassword):
    model = type('lamdbaobject', (object,), {})()
    model.TemporaryPassword = temporaryPassword
    model.Email = email
    return model


t = Welcome('a@b.com','1234')
print(str(t.TemporaryPassword))

score 1 · Answer 2 · answered Sep 12 '11 at 08:15

1

you can define a dummy class first:

class MyObject(object):
    pass

obj = MyObject()
obj.TemporaryPassword = temporaryPassword

answered Sep 12 '11 at 08:15

HYRY

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Yannick Loiseau · Answer 3 · 2011-09-12T11:38:26.953

If you only use the object as a data structure (i.e. no methods) you can use a namedtuple from the collections package:

from collections import namedtuple
def welcome(email, tmp_passwd):
    model = namedtuple('MyModel', ['email', 'temporary_password'])(email, tmp_passwd)
    ...

By the way, if your welcome function only creates the object and returns it, there is no need for it. Just:

from collections import namedtuple
Welcome = namedtuple('Welcome', ['email', 'temporary_password'])

ex = Welcome('me@example.com', 'foobar')
print ex.email
print ex.temporary_password

Add an attribute to a class dynamically at runtime in Python

3 Answers3