brutedns.py syntaxwarning

[devocc17]

here is what i got while trying to run the program.
brutedns.py:53: SyntaxWarning: "is" with a literal. Did you mean "=="?
self.default_dns = True if args.default_dns is "y" else False
Traceback (most recent call last):
File "brutedns.py", line 16, in
import gevent
ModuleNotFoundError: No module named 'gevent'
this could be due some variables not working with the newest version of python or that there's a variable issue.