skip test on py 2

pyftpdlib/test/test_functional.py

@@ -2758,7 +2758,7 @@ def connect_client(self):
         self.client.login(USER, PASSWD)
 
     @retry_on_failure()
-    @pytest.mark.skipif(PY3, reason="PY2 only")
+    @pytest.mark.skipif(not PY3, reason="PY3 only")
     def test_unforeseen_mdtm_event(self):
         # Emulate a case where the file last modification time is prior
         # to year 1900.  This most likely will never happen unless
@@ -2769,9 +2769,6 @@ def test_unforeseen_mdtm_event(self):
         # It causes time.localtime/gmtime to raise a ValueError exception
         # which is supposed to be handled by server.
 
-        # On python 3 it seems that the trick of replacing the original
-        # method with the lambda doesn't work.
-
         class TestFS(AbstractedFS):
             def getmtime(self, *args, **kwargs):
                 return -9000000000