SyntaxError: invalid syntax #12

My python application using gdata (gdata-python3==3.0.1).

While running the application I'm facing following error:

File "/Users/jay.patel/Desktop/myApp 4/app/modules/hc/py/utils.py", line 6, in
import gdata.apps.service
File "/private/var/folders/d8/9b7yg9fd5tb1bmc_wv6xb2840000gq/T/tmpa2VyEF/lib/python3.7/site-packages/gdata/apps/service.py", line 12, in
import gdata.service
File "/private/var/folders/d8/9b7yg9fd5tb1bmc_wv6xb2840000gq/T/tmpa2VyEF/lib/python3.7/site-packages/gdata/service.py", line 64, in
import gdata.auth
File "/private/var/folders/d8/9b7yg9fd5tb1bmc_wv6xb2840000gq/T/tmpa2VyEF/lib/python3.7/site-packages/gdata/auth.py", line 22, in
import gdata.oauth.rsa as oauth_rsa
File "/private/var/folders/d8/9b7yg9fd5tb1bmc_wv6xb2840000gq/T/tmpa2VyEF/lib/python3.7/site-packages/gdata/oauth/rsa.py", line 10, in
from tlslite.utils import keyfactory
File "/private/var/folders/d8/9b7yg9fd5tb1bmc_wv6xb2840000gq/T/tmpa2VyEF/lib/python3.7/site-packages/tlslite/init.py", line 27, in
from tlslite.api import *
File "/private/var/folders/d8/9b7yg9fd5tb1bmc_wv6xb2840000gq/T/tmpa2VyEF/lib/python3.7/site-packages/tlslite/api.py", line 11, in
from .tlsconnection import TLSConnection
File "/private/var/folders/d8/9b7yg9fd5tb1bmc_wv6xb2840000gq/T/tmpa2VyEF/lib/python3.7/site-packages/tlslite/tlsconnection.py", line 71
async=False):
^
SyntaxError: invalid syntax