The test cases (not the example ones, the ones that get run when you press 'submit') don't work in Python 3. They use print as a statement rather than as a function. Should be easy enough to fix while maintaining Python 2 compatability:

from __future__ import print_function

and then use print(x) instead of print x.

It's dumb that the function has to return a word instead of a number. It doesn't make the challenge any harder, it just makes it more annoying and adds a bunch more unnecessary typing.

The parameter really shouldn't be called obj in Elixir. Elixir has no objects of any kind.