song: implement __contains__()

1 files changed, 9 insertions, 0 deletions

diff --git a/nephilim/song.py b/nephilim/song.py
index 6d8cc39..f322fa4 100644
--- a/nephilim/song.py
+++ b/nephilim/song.py
@@ -63,6 +63,15 @@ class Song(dict):
                 return self['artist']
             return ''
 
+    def __contains__(self, item):
+        if dict.__contains__(self, item):
+            return True
+        try:
+            self[item]
+            return True
+        except KeyError:
+            return False
+
     def __nonzero__(self):
         return bool(self['file'])