Changed a format string in the tests so 3.5 should build

.travis.yml

@@ -1,6 +1,7 @@
 language: python
 python:
   - "3.6"
+  - "3.5"
 script:
   - "python3 setup.py test"
 install:

pycmx/channel_map.py

@@ -96,3 +96,11 @@ class ChannelMap:
         self.a3 = ext.audio3
         self.a4 = ext.audio4
 
+    def __or__(self, other):
+        """
+        Return the logical union of this channel map with another
+        """
+        out_v = self.video | other.video
+        out_a = self._audio_channel_set | other._audio_channel_set
+
+        return ChannelMap(v=out_v,audio_channels = out_a)

pycmx/edit_list.py

@@ -3,6 +3,7 @@
 
 from .parse_cmx_statements import (StmtUnrecognized, StmtFCM, StmtEvent, StmtSourceUMID)
 from .event import Event
+from .channel_map import ChannelMap
 
 class EditList:
     """
@@ -35,6 +36,20 @@ class EditList:
             return 'unknown'
         
 
+    @property
+    def channels(self):
+        """
+        Return the union of every channel channel.
+        """
+
+        retval = ChannelMap()
+        for event in self.events:
+            for edit in event.edits:
+                retval = retval | edit.channels
+
+        return retval
+        
+
     @property
     def title(self):
         """

setup.py

@@ -17,6 +17,7 @@ setup(name='pycmx',
           'Topic :: Multimedia :: Video',
           'Topic :: Text Processing',
           'Programming Language :: Python :: 3 :: Only',
-        'Programming Language :: Python :: 3.6'
+          'Programming Language :: Python :: 3.5',
+          'Programming Language :: Python :: 3.6'
           ],
       packages=['pycmx'])

tests/test_parse.py

@@ -21,7 +21,8 @@ class TestParse(TestCase):
             with open(f"tests/edls/{fn}" ,'r') as f:
                 edl = pycmx.parse_cmx3600(f)
                 actual = len( list( edl.events ))
-                self.assertTrue( actual == count , f"expected {count} in file {fn} but found {actual}")
+                self.assertTrue( actual == count ,
+                        "expected %i in file %s but found %i" % (count, fn, actual))
 
     def test_list_sanity(self):
         for fn in type(self).files:
@@ -104,3 +105,7 @@ class TestParse(TestCase):
             edl = pycmx.parse_cmx3600(f)
             events = list(edl.events)
             self.assertEqual( events[4].edits[1].transition.name ,  "CROSS DISSOLVE" )
+
+
+    # add test for edit_list.channels
+