Update test_wave_parsing.py

2.7 test support

tests/test_wave_parsing.py

@@ -1,4 +1,5 @@
 import os.path
+import sys
 import json
 import subprocess
 from subprocess import PIPE
@@ -14,6 +15,17 @@ def ffprobe(path):
 
     arguments = [ FFPROBE , "-of", "json" , "-show_format", "-show_streams", path ]
     
+    if int(sys.version[0]) <  3:
+        process = subprocess.Popen(arguments, stdout=PIPE)
+        process.wait()
+        if process.returncode == 0:
+            output = process.communicate()[0] 
+            if output:
+                output_str = output.decode('utf-8')
+                return json.loads(output_str)
+        else:
+            return None
+    else: 
         process = subprocess.run(arguments, stdin=None, stdout=PIPE, stderr=PIPE)
 
         if process.returncode == 0:
@@ -22,7 +34,6 @@ def ffprobe(path):
         else:
             return None
 
-
 class TestWaveInfo(TestCase):