Is it possible to create anonymous objects in Python?

Question

I'm debugging some Python that takes, as input, a list of objects, each with some attributes.

I'd like to hard-code some test values -- let's say, a list of four objects whose "foo" attribute is set to some number.

Is there a more concise way than this?

x1.foo = 1 x2.foo = 2 x3.foo = 3 x4.foo = 4 myfunc([x1, x2, x3, x4]) 

Ideally, I'd just like to be able to say something like:

myfunc([<foo=1>, <foo=2>, <foo=3>, <foo=4>]) 

(Obviously, that is made-up syntax. But is there something similar that really works?)

Note: This will never be checked in. It's just some throwaway debug code. So don't worry about readability or maintainability.

Answer 1

I found this: http://www.hydrogen18.com/blog/python-anonymous-objects.html, and in my limited testing it seems like it works:

>>> obj = type('',(object,),{"foo": 1})() >>> obj.foo 1 

Answer 2

I like Tetha's solution, but it's unnecessarily complex.

Here's something simpler:

>>> class MicroMock(object): ...     def __init__(self, **kwargs): ...         self.__dict__.update(kwargs) ... >>> def print_foo(x): ...     print x.foo ... >>> print_foo(MicroMock(foo=3)) 3