Using splunklib.client module to use Pythonic interface to the Splunk REST API. I am using the connect method of the module to connect and log in to a Splunk instance.

Code:
import splunklib.client as splunk_client
kwargs_config_flags = {
                'host': "test_instance漢字",
                'port': 8089,
                'username': <username>,
                'password': <password>,
                'owner': None,
                'app': None}
sc = splunk_client.connect(**kwargs_config_flags)

For python 3
Output:
''latin-1' codec can't encode characters in position 0-1: ordinal not in range(256)'

I tried to encode the host to utf-8, "test_instance漢字".encode("utf-8")
Output:
'a bytes-like object is required, not 'str''

For python 2
It is working as expected.
output: 'nodename nor servname provided, or not known'

Is there a way by which this can be handled at the module level?

This looks like an issue with splunklib, which is not distributed with python. 

I'm not sure if it's the same splunklib, but you might try https://github.com/IntegralDefense/splunklib