Merge pull request #91 from robert-kisteleki/master

cover a case where rtt_average does not exist

.travis.yml

@@ -1,9 +1,9 @@
 language: python
 python:
     - "2.7"
-    - "3.4"
     - "3.5"
     - "3.6"
+    - "3.7"
 install:
   - pip install .
   - pip install nose

ripe/atlas/sagan/ping.py

@@ -85,7 +85,7 @@ def __init__(self, data, **kwargs):
         self.rtt_median = None  # Redefined in self._set_rtt_median()
         self.packets = []
 
-        if self.rtt_average < 0:
+        if self.rtt_average is None or self.rtt_average < 0:
             self.rtt_average = self.rtt_min = self.rtt_max = None
 
         if 0 < self.firmware < 4460:

setup.py

@@ -54,11 +54,9 @@
                 "Operating System :: Unix",
                 "Programming Language :: Python",
                 "Programming Language :: Python :: 2.7",
-                "Programming Language :: Python :: 3.1",
-                "Programming Language :: Python :: 3.2",
-                "Programming Language :: Python :: 3.3",
-                "Programming Language :: Python :: 3.4",
                 "Programming Language :: Python :: 3.5",
+                "Programming Language :: Python :: 3.6",
+                "Programming Language :: Python :: 3.7",
                 "Topic :: Internet :: WWW/HTTP",
             ],
         )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py27,py34,py35,py36
+envlist=py27,py35,py36,py37
 
 [testenv]
 commands=python setup.py test []