Creating objects on the fly in Python

Asked Apr 03 '14 at 18:35

Active Apr 03 '14 at 18:38

Viewed 2,118 times

Why do I need

class DummyObject(object):
    pass

in order to make

dummy = DummyObject()
dummy.foo = 42

Why isn't this legal in Python?

dummy = object()
dummy.foo = 42

Which gives the error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'object' object has no attribute 'foo'

edited Apr 03 '14 at 18:38

mhlester

asked Apr 03 '14 at 18:35

2

Very good question but it seems it already has an answer here: http://stackoverflow.com/questions/1529002/cant-set-attributes-of-object-class – skamsie Apr 03 '14 at 18:39
7

As with many "why" questions about Python, the answer is "because Guido said so." – Wooble Apr 03 '14 at 18:40
You could always do: `dummy = type('Dummy', (object,), {})()` – Joel Cornett Apr 03 '14 at 18:42

0 Answers0