You're using ubuntu aren't you? .. yeah, dump that run
Debian 7 as recommended and tested in, I can't offer support for all other variants or I'd be doing so forever, Debian 7 is testing with the minimum requirements listed.
You can overcome this issue by replacing
from requests.packages.urllib3.poolmanager import PoolManager with
from urllib3.poolmanager import PoolManager in
MyAdapter.py#L2