The setup package seems to lack the necessary subfolders. As a workaround I've installed a github clone with pip install -e .. When installing from PyPi with pip install seatsio I get this:

pip freeze | grep seatsio

seatsio==2

ls -al /usr/local/lib/python2.7/site-packages/seatsio

total 64
drwxr-sr-x 2 root staff 4096 Sep 3 11:52 .
drwxrwsr-x 1 root staff 4096 Sep 3 11:52 ..
-rw-r--r-- 1 root staff 63 Sep 3 11:52 init.py
-rw-r--r-- 1 root staff 241 Sep 3 11:52 init.pyc
-rw-r--r-- 1 root staff 689 Sep 3 11:52 client.py
-rw-r--r-- 1 root staff 1152 Sep 3 11:52 client.pyc
-rw-r--r-- 1 root staff 3802 Sep 3 11:52 domain.py
-rw-r--r-- 1 root staff 6797 Sep 3 11:52 domain.pyc
-rw-r--r-- 1 root staff 1210 Sep 3 11:52 exceptions.py
-rw-r--r-- 1 root staff 1562 Sep 3 11:52 exceptions.pyc
-rw-r--r-- 1 root staff 3960 Sep 3 11:52 httpClient.py
-rw-r--r-- 1 root staff 6464 Sep 3 11:52 httpClient.pyc
-rw-r--r-- 1 root staff 190 Sep 3 11:52 util.py

How to get Json response of the Object