Due to the split of urllib2 into parts (urllib.error, urllib.parse, urllib.request) the library cannot be used with python 3.6.6.

Once the client code updated to urllib another problem occurs:
../python3.6/site-packages/eureka_client/requests.py", line 46, in create
response = request.opener.open(request)
File "/usr/lib/python3.6/urllib/request.py", line 524, in open
req = meth(req)
File "/usr/lib/python3.6/urllib/request.py", line 1248, in do_request
raise TypeError(msg)
TypeError: POST data should be bytes, an iterable of bytes, or a file object. It cannot be of type str.

On SO recommend to encode url into utf-8:
data = urllib.parse.urlencode(data)
data = data.encode('utf-8')

But then another error follows:
..lib/python3.6/site-packages/eureka_client/requests.py", line 42, in create
data = urllib.parse.urlencode(data) # I added this
File "/usr/lib/python3.6/urllib/parse.py", line 864, in urlencode
"or mapping object").with_traceback(tb)
File "/usr/lib/python3.6/urllib/parse.py", line 856, in urlencode
raise TypeError
TypeError: not a valid non-string sequence or mapping object

How to fix it?

When i run the next test:

from eureka_client import EurekaClient
import logging
logging.basicConfig()
ec = EurekaClient("MyApplication",
                  eureka_url="http://localhost:8080/eureka/v2/",
                  region="eu-west-1",
                  use_dns=False,
                  data_center="asdasdasd",
                  vip_address="http://localhost:7001/",
                  health_check_url="http://localhost:7001/app1",
                  host_name="localhost",
                  port=7001,
                  eureka_port=8080)
print ec.register()

I receive the next error:

Traceback (most recent call last):
File "test.py", line 20, in
print ec.register()
File "/usr/lib/python2.7/site-packages/eureka/client.py", line 161, in register
raise EurekaRegistrationFailedException("Did not receive correct reply from any instances")
eureka.client.EurekaRegistrationFailedException: Did not receive correct reply from any instances

When i curl the next url:

http://localhost:8080/eureka/v2/apps/MyApplication
I receive 404 but when i curl the next url:

http://whclsf-teva-dev-cc-bck4:8080/eureka/v2/apps/
I receive response status code 200 which means eureka server is up and running

the issue here is:
I ran the same configuration with Prana and it worked for me. but with your module, it didn't work!
According to the error and the code, you assume that my app was registered before or already registered!
what am i doing wrong?