Cant pass input variable from keyboard to docker/utils/utils.py

Hi guys, I'm pretty new to the docker api, so basically Im trying to use docker.Client with a python script using input ip as variable, Im getting this error. any Ideas?.

script ->
import docker
import re
import sys
ip = sys.argv[1]
cli = docker.Client(base_url="'http://"+ (ip) +":4243'")

usage : >
python3 docker-jen.py 192.168.1.122

Traceback (most recent call last):
File "docker-jen.py", line 10, in
cli = docker.Client(base_url="'http://"+ (ip) +":4243'")
File "/usr/local/lib/python3.5/dist-packages/docker/client.py", line 59, in init
base_url, constants.IS_WINDOWS_PLATFORM, tls=bool(tls)
File "/usr/local/lib/python3.5/dist-packages/docker/utils/utils.py", line 415, in parse_host
"Invalid bind address protocol: {0}".format(addr)
docker.errors.DockerException: Invalid bind address protocol: 'http://192.168.1.122:4243'

According to utils.py line 415 the error should be generated if no protocol is used, but in the bold line above I can see it passing thru. what am I doing wrong? if I perform that script using an static ip from the code it works like a charm.

many thanks in advance and sorry if this is a silly question.

Start with the provided script and the docker.Client call, then inspect docker/utils/utils.py around line 415 and reproduce the command with the supplied IP argument. Determine whether the reported error is caused by the constructed base_url or by the library; done means a verified explanation or a narrowly scoped, reproducible library fix.