This update for python-nltk fixes the following issues:
Update to 3.4.5 (boo#1146427, CVE-2019-14751):
Update to 3.4.4:
Version update to 3.4.1:
Update to v3.4:
Updated to v3.3:
This update was imported from the openSUSE:Leap:15.1:Update update project.