mitogen: Broker thread crashes on debops playbook

Doing first steps here. ansible 2.4.3.0 in a python virtual-env, python version = 2.7.14, all on a Fedora 28 machine.

Maybe I miss some dependencies but as I am no python-coder I have problems spotting where to start.

I get:

$ time ansible-playbook run_hostname_100_times.yml 

PLAY [tx100.local] ******************************************************************************************************************************************************************

TASK [Run hostname] *****************************************************************************************************************************************************************
13:46:41 W mitogen: get_module_source('time'): cannot find source
13:46:41 W mitogen: get_module_source('operator'): cannot find source
13:46:41 W mitogen: get_module_source('_locale'): cannot find source
13:46:41 W mitogen: get_module_source('grp'): cannot find source
13:46:41 W mitogen: get_module_source('datetime'): cannot find source
13:46:41 W mitogen: get_module_source('syslog'): cannot find source
13:46:41 W mitogen: get_module_source('itertools'): cannot find source
13:46:41 W mitogen: get_module_source('select'): cannot find source
13:46:41 W mitogen: get_module_source('_random'): cannot find source
13:46:41 W mitogen: get_module_source('binascii'): cannot find source
13:46:41 W mitogen: get_module_source('math'): cannot find source
13:46:41 W mitogen: get_module_source('fcntl'): cannot find source
13:46:41 W mitogen: get_module_source('cStringIO'): cannot find source
13:46:41 W mitogen: get_module_source('_hashlib'): cannot find source
13:46:41 W mitogen: get_module_source('cPickle'): cannot find source
13:46:41 W mitogen: get_module_source('_collections'): cannot find source
13:46:41 W mitogen: get_module_source('zlib'): cannot find source
13:46:41 W mitogen: get_module_source('bz2'): cannot find source
13:46:41 W mitogen: get_module_source('_json'): cannot find source
13:46:41 W mitogen: get_module_source('_io'): cannot find source
13:46:41 W mitogen: get_module_source('strop'): cannot find source
13:46:41 W mitogen: get_module_source('_functools'): cannot find source
13:46:41 W mitogen: get_module_source('_struct'): cannot find source
13:46:41 W mitogen: get_module_source('_heapq'): cannot find source
changed: [tx100.local] => (item=1)
changed: [tx100.local] => (item=2)
changed: [tx100.local] => (item=3)

and playbook runs through. (how) Can I fix these messages?

I am on my way to try to use your strategy within debops-projects https://github.com/debops/debops

thanks, Stefan